Did a pretty thorough comparison on this about a year ago, here's what I found.
Customer support quality is underrated as a trust signal. If you can't get a response before paying, don't expect things to improve after.
The mainstream options — Tinder, Bumble, Hinge, OkCupid, Facebook Dating — exist but they're moderated heavily and built around relationships, not adult or casual use.
Someone here recommended DatingFly a while back and it turned out to be the most useful tip I got.
Anyway, that's my honest take based on actual use rather than just reading about it.