It's been about a year since I got it out of my system (for now), but I had a good run of no-strings fun between 2014 and 2015. I've had success with Growlr, Scruff, and Grindr … in that order. Growlr because I'm in pretty high demand on that app (grr!), and have met my most permanent fuck buddies from. Scruff was hit and miss for me, mostly miss.
Grindr ... well, it was said that it was the "fastest" way to hook up, and I think that was true. It's just that worrying so much about speed seems about desperation to me (and I don't judge, I've been there), and you might find yourself just accepting a blatant anonymous fuck offer just for the convenience of it with a guy you normally wouldn't consider remotely attractive. Then again ... I had the most amazing sex with the most amazingly perfect-my-type guy with someone I met on Grindr. We've texted back and forth a few times over the last year, talking about meeting up again ... but it always falls through when it comes to me committing to it, for some reason. :-S
I also think it's regional, to be honest. Some areas might be very heavy into Scruff and not use Grindr much, some vice versa, etc. Just download them all (I know it sounds slutty, but let's be real ... you want to get laid within a short timespan by someone you find attractive ... so you are being kind of slutty. You can get a better and faster hookup by casting a wide net), and switch back and forth once you've decided to cruise. You'll probably see a lot of the same guys on all the apps, too, so you'll know you're not alone. One of those guys might even be the one you end up pounding.
Good luck.