well I wouldn't say one is better then the other, it depends on what you want. Superchargers generally dont give more HP then turbos, usually Turbos give more HP. I belive Superchargers are easier to install (but dont quote me on that)
Superchargers
Run off a belt
Use up some engine power to make power
Give virtually instant throttle response (no lag)
harder to increase boost(HP)
Require less engine tunning
good for daily driving
Turbochargers
Run off exhuast
dont always repond instantly at low RPM, TURBO LAG (larger turbos have more lag then smaller ones)
Easier to increase boost (more HP) B)
require more engine tunning
(sound better IMO especially with a BOV
)
good for daily driving & drag racing (depending on kit used)
Most mild TC and SC kits dont require building internals, however if you start to increase your boost beyond that i.e. If you want mad power and you want your eninge to last then before you start increasing Boost pressure to insane levels I would suggest:
Forged pistons and rods are a good place to start(lower compression ones will be better)
Metal head gasket
(Block sleeves - only if you really want to get crazy)
Front mounted intercooler
Oil cooler
I think TODA makes forged internals for boosted B series as part of there stroker kits
Crower and Eagle both make good parts as well
thats all I can think of for now, other people here probably know more then I do on this subject so also try searching around a bit in the FI forum.
Peace B)