Heres my 2 cents..............
Everyone is correct about the SR being cheaper and easier to get parts for. It is, trust me.... I had my friends in Japan looking for parts for my motor all the time.
Quick background on me... Had the SR in my 240sx from 1997 to 2001 then went to a RB25. Currently have a Pro import Datsun 510 w/ SR20 making about 400+ if I can get more time to set the motor up. On a self, 800+hp SR waiting to go into the dragcar once the car is set up for the track.
As for the Rb bring only show or Drag.... WRONG... The SR would be better for Drag racing then a RB25. This is why I have the SR in my dragcar and not the RB25. You can get more power and a higher shift point out of the SR then the RB25. Drag racing is all about topend speed and power. For all else you need the power band every where. Unless you like shifting all the time and reving the hell out of the motor......
But as for canyons, drifting, road courses and autox.... I would go for the RB. The power on the RB is alot smoother then the SR. This will allow the driver to use the whole power band and not just the top end like you would do on the SR. I did canyon racing and drifting with the SR and loiked it but I love the RB's power band for the Canyons.
Think of the SR like a 2 stroke bike and the RB as the 4 stroke. The 2 stroke is a very rev happy and makes great power on the top end but the bottom end is dead. The 4 stroke power band is great from bottom to top, but you can't rev the hell out of it like a 2 stroke.
For more info check out this older topic on the RB
http://www.zilvia.net/f....0;st=25
I hope this helpes you out.
Grumpy
www.mckinneymotorsports.com