Re: swap JB for crunch lab??
Depends on what you like...
The Crunch Lab has fuller sounding cleans and a "crunchy" bottom end that works great for palm muting. Plus, it's slightly more modern voicing works well for styles where you need tight/fast tracking.
However, under gain, the JB has broader dynamics, is more versatile as a result and has nicer sounding harmonics (fuller/smoother), if that matters to you.
Here's a decent comparison. Listen through good speakers (and ignore the Norton, which wasn't quite compared fairly in this vid):