JB is great if you're concerned about warranty as it can't be detected, power jumps from 168Kw atw to 190~192 atw everywhere so it's very real for the $. The flipside is a decent tune with nothing else by a couple of decent places will get you from 210~225Kw atw. Thats fact, no BS mythical figures.
The tune will kill the JB on the roll due to its superior midrange but the JB can still be tweaked to give a good top end too - not far behind the tune however at that point you have to be carefull and watch AFRs and knock retard
They are both good just different