if u get the same turbo and set it at the same psi then the gsr or type r will beat a ls....the compression has nothing to do with speed....
high compression + high boost = blown engine
low compression + moderate boost = good
they say ls/rs/gs are better for turbo cuz you can run about 8 -12 psi without rebuilding your pistons and stuff
gsr and type r have higher compression rate so adding the same amount of boost to these will put alot of strain on the pistons and they might blow up
with all that said...if u have the same turbo and set it on the same boost level....whoever has the faster stock car to begin with will win