If anything the question manages to tell about a person's tuning preferences......
here we have a very realistic and rational point of view .....parts .....yes since they are such a problem in pakistan and getting a hold of the correct parts really steers your decision towards the SR ......the merits of the RB just become overshadowed ......although the heritage and sound of the engine are more desirable ....you have to step back and say what I really want
although I have seen people(tuners) abroad leaning towards the RB more due to ease of parts.
but apart from the regional issue
I think what datpak(baqir) just said that yes SR evokes an instant reaction of the Japanese Silvias , low cost power and endless data and punishing by the tuners.
deep down the smooth power delivery , and the ''RB-Muscle'' factor , and the improved response to extensive tuning will bring out a more menacing monster
but one more thing to evaluate is the actual car itself
I mean our brains are hot-wired to relate
Silvia S12,S13,S14 ,S15/180SX = SR
Skyline R30, R31, HCR32 GTS-T, R33 GTS-t, ER34 GTS-t, stagea , laurel, cefiro = RB
as a knee jerk reaction .....
Lol I sound like a shrink now hehehe
lets carry the momentum of this discussion forward............