take a deep breath there, big guy...

or, it might be because neither one is suited to the kind of riding i'd use it for. since you gave us zero info on how you'll use the bike, it's all i have to go on.

in a nutshell i prefer something else because:

pista...too steep (er, quick and agile), TT too short, no bottle bosses, generic steel.
steamroller...geometry more to my liking, too utilitarian, heavy, generic steel, one bottle boss.
both...crappy components as pre-built, props to surly for offering a frameset option.

ps - i'm not hatin', just sayin'. mine is a sputnik, built from a frameset. works well for me.