BB was in 2016 definetely on 2nd rank and in 2017 again on 2nd rank cause Bit-Exo is and was on 1st rank if you like it or not and Jackpotracer was on 3rd rank and Bubbles was never seen as all other 1000+ apps never reached rank 4
Definitely BetterBets will be the most famous one with lots and lots of users pouring in and betting, but BubblesBit also a great app and populated most of the time.