There is no universal winner
Ask which channel is best and you will hear confident answers, usually from whoever sells that channel. The honest answer is that it depends on your prices, your list and your offer. A channel that earns well for a restaurant can lose money for a consultancy. The useful question is not which channel is best, but which one earns most for you, and how you would find out.
What each channel is like
| Channel | Often a good fit for | Watch out for |
|---|---|---|
| Conversations: questions, bookings, order help, and offers where a quick reply closes the sale | Per-message charges, template approval, and the need for opt-in | |
| SMS | Short, urgent notices and reminders | Registration rules, route costs and limited length |
| Longer content, newsletters, receipts and low-cost broad reach | Spam filtering, crowded inboxes and slower replies |
These are tendencies, not rules. Your own audience decides.
Cost per message is only the start
Email is usually the cheapest to send. SMS is often next. WhatsApp template messages cost more per message, because Meta charges for them by category and country. But the price of sending is only the first line of the sum. What matters is what each message brings back.
A cheap message that few people open can cost more per sale than a dearer one that many people answer. That is why the next section is about the whole chain.
Compare the whole chain
For each channel, write down:
- How many of your messages are delivered.
- How many of those get a click or a reply.
- How many of those responses become orders.
- What each order is worth, and how much of it you keep.
- What all of this cost, including fixed fees.
Then compare the net profit and the return on cost. The two can disagree. A small, cheap channel can show the highest percentage return, while a larger one leaves you the most money. If your list is your limit, follow profit. If your budget is your limit, follow return.
Run the sums
The free WhatsApp vs SMS vs email ROI calculator does this comparison for you. Enter your list size, your order value and margin, and each channel's price and rates, and it shows the profit, the return, the cost of each order and the break-even conversion. The numbers it opens with are examples, so replace them with your own.
Then test, in small steps
A calculator makes your assumptions visible. It does not make them true. To get real figures:
- Send the same offer on each channel to similar groups of people.
- Give each channel its own coupon code or tracked link.
- Run it more than once, because one send is noisy.
- Put the real results back into the calculator and decide again.
Many businesses use more than one
The channels often work best together. Email carries the longer story, SMS carries the urgent reminder, and WhatsApp carries the conversation that turns interest into a sale. If WhatsApp looks worth it, start with people who have agreed to hear from you, and read how approved message templates work before you send your first campaign.
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