I believe the S13, 14 and 15's, 180SX and Skyline R32's used Garret T28 turbo chargers. They had ceramic internals, which can take a lot of heat but are not as strong as steel internals and keep in mind these cars are over 10 - 15 years old and will need replacing / rebuilding sooner or later.
BTW I think the S15 was upgraded to steel internals (Stronger) and was a ball bearing turbo charger - quicker spooling for the turbine blades.
180SX were in production from 1989 - 1998.
R33 was from 1995 - 1998.
I think the 180SX has more of a 'Classic' look due to the hatch back styling.
Better interior, maybe cuz Skylines are seen as the type of cars above the Silvias and 180SX, so they gota better look. In my opinion I really don't car about the interior, it does nothing, performance wise, its all just for looks.
Personaly I like the look of the 180SX better, Red or White body with Black roof, Vertex bodykit and Nismo LMGT4 wheels = Looks sick!
BTW Nismo LMGT4 wheels are NOT pictured. LOL!