facts only
2jz is better, 1jz is cheaper

opinions

1jz is an affordable alternative that will make a lot of peoples' 400-500 hp dreams come true, 2jz can do the same and a whole lot more ,more reliably, but more costly

there are some interchangeable parts which makes it a lot easier to go to toyota and get supra parts (not that they ever have anything on the shelf anyways) to interchange with, unlike an rb25 i can't get hardly anything in us for.

i must say however that i'm not jumping at the chance to extend a 1jz wiring harness