This is the most common argument in Meta lead generation, and both sides are right about different numbers. Instant forms win on cost per lead. Landing pages win on cost per sale. The correct answer depends on your follow-up speed and your deal value.
What instant forms actually do
Meta instant forms prefill name, email and phone from the user's profile and never leave the app. Friction is near zero, so conversion rates are high and cost per lead is typically 40–60% lower than a landing page.
The same lack of friction is the problem: people submit without absorbing what they signed up for. Contact rates and show rates are lower.
What landing pages do better
A landing page makes people read, scroll and type. That effort filters out the uncommitted, and it lets you explain price, process and proof before asking for details. Leads cost more and close better.
Pages also give you full control of tracking, which matters when you are feeding conversion data back to the algorithm.
The fix for instant form quality
Switch the form to "higher intent" (adds a review step), add two or three custom qualifying questions, and remove prefill on the phone field so people type it. These three changes typically cut junk leads in half while keeping most of the cost advantage.
How to decide
Use instant forms if your deal value is low, your volume needs are high and you can call within minutes. Use landing pages if your deal value is high, your sales team is small, or your offer needs explaining.
If you are unsure, run both as separate ad sets and compare cost per qualified lead — not cost per lead. That single change of metric usually ends the argument.
Measure them on the same basis
Instant form leads never touch your site, so they only appear in your CRM. Landing page leads appear in GA4, Meta and your CRM. Comparing platform numbers against CRM numbers is how teams reach wrong conclusions — line them up first with a consistent measurement setup.