The best coasters ever are:
Brainteaser at SFDL. There is so much speed, air time, and g-forces on that thing. It is also so freakin' tall!
Manhatten Express. That ride is so smooth. Way smoother than any B&M coaster.
The worst coaster ever is SROS at SFNE. There is like no airtime or g-forces on that ride. The layout isn't unique. It is easily the roughest coaster ever built! It is the worst coaster ever