Almost every article on this question ends in the same place. Use both, they say, because the channels work better together.
They do work better together. That is also useless advice for a company with one person doing outreach and no infrastructure, which is most companies asking the question.
So here is the answer before the reasoning. If you have one person, no sending infrastructure and you need fewer than 10 real conversations a month, start on LinkedIn, because you can start on Monday. If you need double-digit meetings a month, start with cold email and accept that it will take about a month before the first campaign goes out. If your buyer does not keep a LinkedIn profile, the decision has been made for you.
The rest of this is how to work out which of those three you are. If the real question underneath is whether the email channel is worth starting at all, that is a bigger question than this post answers.
What each one actually costs to switch on
The two channels have different start-up costs and different ceilings, and that is what should decide the order.
Cold email cannot be started this week. You need domains that are not the one your invoices come from, mailboxes on those domains, authentication records configured correctly, and weeks of warm-up before any of them touches a stranger. Done properly, that is about a month of setup before a single prospect hears from you. In exchange you get a channel with almost no ceiling. Want ten times the volume next quarter, buy more domains.
LinkedIn starts on Monday. A seat, a profile a stranger would not wince at, and your own time. In exchange you get a hard ceiling. One account can only touch so many people in a month before the platform starts treating you as a robot, and that number is low enough that it will cap your pipeline long before your ambition runs out.
One is slow to start and cheap to scale. The other is instant to start and expensive to scale, because scaling means more humans with more seats.
Why "do both" is the most expensive answer
A company with one person and a small budget who decides to run both ends up with two half-built channels.
The email side never gets enough domains, so volume stays low and the data is too thin to tell you anything. The LinkedIn side gets whatever time is left over, which means the profile stays half finished and the messages go out in bursts when somebody remembers.
Then neither channel produces a readable result, and the verdict at the end of the quarter is that this market does not respond to outbound. In fact nothing was ever run at the volume where a result becomes legible.
There is no one shape of outbound that fits every business, and the mistake is not picking the wrong channel. It is spreading a budget that could just about support one channel across two.
The three questions that decide it
How many conversations do you need a month?
This is the arithmetic that rules channels in or out. A month that ends with 30 to 35 sales calls on the board started with at least 10,000 people contacted. One LinkedIn account cannot get anywhere near 10,000 touches, and neither can five of them.
Average cold email reply rates sit around 3.43%, with top performers exceeding 10%, measured by a sending platform across its own users, so take it as a range rather than a rule. Either way, you can see what that does to the arithmetic. Small percentages of big numbers. If your target is double-digit meetings a month, only email gets you the big number at a price you can pay.
If your deal size means 5 good conversations a month changes your year, the opposite is true. At that size, 10,000 touches is over-engineering, and LinkedIn will comfortably produce 5.
What can you spend before anything comes back?
Total budget is the wrong figure to look at. The one that matters is what you can spend in the first two months, while almost nothing comes back.
Cold email has a real setup cost and a real dead period. If that dead period is going to make somebody in your company lose their nerve, do not start there. A channel that gets switched off in week five because it has produced nothing was a waste of the whole budget.
LinkedIn has no dead period. It has a lower ceiling and your first conversations can happen in the first week.
Is your buyer actually there?
Three quarters of B2B buyers use social media to inform their purchasing decisions, and LinkedIn is reported on that same page to generate about 80% of B2B social leads. Good averages. Averages are not your buyer.
Check the last 20 deals you closed. Open the profiles of the people who signed them. If most of those profiles have no photo, no activity and a job title from two companies ago, that channel does not exist for your market, whatever the aggregate says. Plenty of operations, manufacturing and public-sector buyers live in their inbox and nowhere else.
The verdict, case by case
One person, no infrastructure, needs a handful of conversations. LinkedIn. Start this week. Build the email infrastructure in the background with the money the first deals bring in.
A team that needs double-digit meetings every month. Cold email, and be honest with everyone about the month of setup before anything sends. Do not let anybody judge it before it has sent at volume.
A buyer who is not on the platform. Email, no debate, and stop reading comparison articles.
A profile that would not survive being looked at. Neither yet. Both channels end with the same person opening your profile, so fix that first. It is the cheapest thing on this list and the one people skip.
When the second channel earns its place
Once one channel is working and you can predict roughly what a month produces, add the other one. Not before.
My own default, when both are running, is that the email is never the first thing a person hears from me. A profile view and a connection first, then the email lands on a name they have seen before, which is a completely different email from the same words arriving cold. That order matters more than most people expect.
But that is a problem for the quarter after this one. Right now, pick the one your budget can actually support, run it long enough to read the result, and take the honest answer.
If neither channel produces anything after a real attempt at one of them, stop comparing channels. Go and check whether this kind of selling fits your business before you spend another quarter on it.