+1 from what drove of the 276 it seemed to run out of revs before it should tbh whereas my 296 revs and revs. The interior is the thing that actually swayed me to buy the 296, and of course the nismo kit. If there was an hr nismo the same I would have bought it tbh.
Thats where you need the cars side by side though. Yes the Revup engine revs higher, but it has less torque lower down. Whether or not this actually makes a difference on a track I have no idea. An educated guess would say the Revup would have it on the track and standard DE would have it on normal driving (ie when not at 9/10ths). Its all perception though until you get them next to each other.
Going between one and the other I've never noticed any massive difference where you say "wow" thats a lot quicker. The only one thats done that to me was going from an original VQ35DE to the VQ37VHR. Talking only about stock engines, no NOS, FI etc.