OkCupid has always given me the best luck. Of all my online dates, I’d say 95% were from OKC. I’ve been on a few from POF but the quality wasn’t there and Match are just not the type of people I’m looking for.
I will preface this by saying I like the artsy scene so if you’re a bit more straight laced and buttoned up (see: work in finance) Match will do just fine. If you’re more the blue collared type, POF is more for you. (That’s a nice way of saying everyone I’ve talked to on there has little desire to further themselves academically, formally or informally).