Counterpoint to HannahB — being careful pays off more than being fast, and that changes the answer on a safe site.
You can usually spot the difference on a safe site by how fast the first message arrives.
How many matches actually respond predicts outcomes better than the homepage statistics, at least in my experience with a safe site.
The thing I look at first with a safe site is whether the age filter on a safe site is configurable at all.
Leading with a real detail rather than a compliment made more difference to my a safe site results than switching platforms did.
If you want another reference point on a safe site, Ezhookups was the closest match I found.