To which page should in-product banners point?

Currently in-product banners (see below) point to customers.gitlab.com/trials/new.

The issue I worked on wanted me about.gitlab.com/sales/ and we also have about.gitlab.com/free-trial/.

I feel like there are many open questions:

Which is the correct page?
Do we want to do A/B testing to see which would result in higher conversion?
Are differences for different upgrade plans, e.g for Premium -> Ultimate vs. Starter -> Premium

Depending on which page we choose we'd probably need to add some functionality to the forms, like which feature was clicked to land on the form.

I do not know who to ping here, but I'll try my best:

Relevant images: