Look they are both nuggets that empty my wallet, keep me busy, make me drink a lot, force me to spend less time with my family, make me loose hair, made my nuts twist in their sack etc...etc...
Some like pepsi...others like coke...
some like racing cars...others like stacking pallets...
who cares...pick an engine and love it, flog it to death, have some fun and scare the sh1t out of your mates with it.
I love the RB engine from RB20 to RB30...
My engine will out torque nearly all RB30's ive encountered and matched the ultimate torque engine RB29 from racepace in all but the very low rev range and was all over it in the midrange where it really counts.
Even the RB25 i just built for NYTSKY matched torque figures with a 400KW 2JZ...its not what you build but how you build it. Just because you use a bigger bottom end does not save it from being a bucket of sh1t.
Wait till i get into the RB30's...ill have a few surprises im sure.