When someone wins with an LS platform 5 years in a row against the sbf, then they will get my attention. When someone takes an LS powered car with less than 430 ci, single carb, cast intake, and dominates a class full of blown 500 ci aftermarket hemis and 750+ ci mutiple nitrous kit powered cars, then they will have my attention. Until then, all this 'LS is superior' talk is just that, talk. No concrete evidence to back any of it up other than friday night t&t sessions.
Where the LS1 currently has an advantage is street level, or mild race type stuff, many of the combos are laid out, and there is a ton of support on the forums for all kinds of different setups. You can get on LS1tech and trip over all kinds of cheap ass ways to make 400-500 rwhp N/A, pump gas, efi, hydraulic roller. Sign in on this site, and you see guys stuck in the 80's for the most part. You have the douchebag entry level guys that think a bcam is awesome just because it isnt stock, that you need a 65mm tb or smaller, and all kinds of other stupid ####. Then you have the more all out guys on here, or on the more "hardcore" SBF sites that are hardcore race only types. There is middle ground, but it's few and far between compared to the LS1 stuff.
Dont get me wrong, plenty can be done with an SBF, but it just depends on your goals and budget. For an ALL OUT BALLS TO THE WALL CLASS RACER, the SBF, SBC, BBF, and BBC are proven, and are the way to go, but when it comes to the run of the mill street or mild race applications, the LS1 opens alot of doors! Those motors are more modular than Ford's so called Modular Motors.
I like boosted setups, and as far as "kits" go, everything, blower or turbo is BIG DOLLAR for an LS1 car, even used, and thats what kind of sucks. Putting together a 550-700 (and more with $$$$) rwhp nitrous combo isnt hard though.