Really hard question to answer...
To me, the Sigma Sting is just an incredibly good ball. Absolutely love mine. My teammate has one as well and barely uses it.
I also have a revolt that I don't care for much. Barely gets used. My teammate has two, one of which is the best rolling ball he owns.
The mix of layout, lane condition, and bowler specs makes a huge difference. My teammate and I even have similar specs (both have plenty of revs but high ball speed that over powers the rev rate, I have slightly higher tilt than him) and bowl on the same conditions, and we are getting vastly different experiences with the balls. A good pro shop that knows your game and the lanes would be much better equipped to answer.