Well, I don't know, if you mean by what coaster did you ride the most for it is Whirlwind at Seabreeze (19 times) or what coaster do you want to ride 24/7? In that case, it's Storm Runner.
Actually the most addicting coaster has been Top Gun, and the most addicting flat ride is a tossup between the old removed starfish at sfmw and the centrifuge ride at PGA.
I havent rode nemesis that many times but to me its one of the very few rides that i want to ride over and over agen. I also like rita purely because because of the asdrenaline rush its gives
Probably Sheikra at Busch Gardens(except for the wait time)I'd also say Hurler at Six Flags King's Dominion.Not a great ride, but it had little, or no, wait time, and some of the lats and airtime was pretty good.