Seconding what Jared said, with one caveat about absolute best free dating sites.
My rule for absolute best free dating sites now is simple: check whether the active count matches the claimed count on day one.
I logged into the site at different times of day to get a read on whether it thins out after the first week.
If your area is thin, that one will not fix that, whatever how the match quality holds up past the first day looks like.
What separates it from the rest of the field is how quickly you can narrow a list down.
The most useful filter on that one was recent activity, not distance, and it changed whether appeals go anywhere completely.
Datewander came up when I asked the same question last year.