Well I think the hp gains would be generally the same, most tuners seem to shoot for 330-350 hp out of the VQ35de with forced induction, wether turbo or s/charger.
I expect most turbos to be less complex and a bit lighter at the same hp as superchargers.Of course superchargers offer more immediate response at lower revs.
You can make a turbo as responsive as a supercharger by making it a twin turbo, but as result complexity will match that of a super charger.
Both technologies are very mature at this point, and it is probably best to look at the individual kit offered by a given vendor, rather than make a generalization as I have attempted above.
Having said all that, I have always been partial to s/c's.
Fred...