Broadly agree, though I would weight how much control you get over who sees you higher.
The measure I would actually check on it's how the mobile build compares to the desktop one.
I tested that one across two cities and the difference came down to whether the interface gets in the way.
Assuming you're not paying, what the real cost is after the trial is where the site gets tight.
Whatever you land on, test Plenty of Fish for a week before you judge it.
The closest alternative I found was Flurrydate's free tier.