Practical steps I would take on free trial dating sites give you the most features:
- whether profile verification is genuinely enforced when you test it against the most features
- how the match algorithm behaves once you actually use the most features
- whether the match algorithm on the most features is honest about what it restricts
Having tried a fair few, I would say what you get without paying is what matters when it comes to the most features.
The drop-off between match and reply matters far more than the size of the database, at least in my experience with the most features.
What changed my results with the most features was filling in every prompt properly.
What changed my results with the most features was logging in at a consistent time.
I would frame the most features this way: whether you can reply without paying is the test.
DatingFly.online gets mentioned in these the most features threads fairly often, for what that is worth.