I'll be the first not to go on about SR vs. RB.
Skyline gets votes for handling. Double wishbone vs Strut, take your pick. I'd go wishbone.
Chassis. Not keen on R33 as it's not hardcore (personal preference), but the 180 doesn't feel that firm. Lines are have a more communicative chassis.
Brakes, 4 pot and 2 pot for lines, 2 and single for 180. I love my brakes, and bigger/more is always better.