I personally would choose the 1JZ over the RB25 but I can't say which is "better" as I have neither the mecahnical knowledge nor the experience to be able to compare the 2 fairly.
I think this comes down to what people feel is more important to them and what they like. Weather you choose a motor because of it's tuneability, how much power it'll handle on stock internals, parts availability, manufacturer.... whatever it may be.
This thread is a matter of opinions... not fact, and no one has an incorrect opinion (misguided or technically incorrect perhaps but not an incorrect opinion)