I'd have to say that the Iron Wolf at SFGAm is the best. I'm comparing this with Mantis, King Cobra, and the Vortex at Carowinds. It kicks butt for it's great drop, excellent airtime in the back and a disorienting ending. Yah, it's a little rough at times, but that's just part of the fun!
King Cobra has to be the ALL TIME WORST stand up ride IMHO. Sure it was the first and I have ridden it several times at PKI, but what a boring and uncomfortable ride, TOGO GO HOME! If I could borrow 3 more hands I would give it 5 thumbs down. Iron wolf at SFGA is light years ahead of KC at PKI, but B&M didn't quite have their act together yet. At least compared to the quality of their rides today. Look at how much better Mantis and RR@SSMM are. I only rode that ride (Iron Wolf) 1 time on a 2 day trip to SFGA last year. Got to give the nod to Mantis because I haven't ridden Riddler's Revenge yet or any of the others mentioned. Rollcoast, I must like the smoother rides better. Everyone has an opinion and I like hearing everyone elses even if I don't agree :) :)
And i'd go with Chang. Suprising as it may be. But i liked the ending of Chang compared to the headbanging on the Mantis. Afterall they are the same ride throught the block breaks. Oh and one more thing, there are no trims on Chang's hill! (at least the last time i was there)
Although I'm not big on stand-ups I like Chang for it's speed and size and King Cobra (PKI) for it's airtime. I've not had the chance to ride Mantis (always too crowded). And Iron Wolf (SFGAm) bangs my head a lot.
------------- Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." - Albert Einstein