If I am going to rehearsal with the band, I have my HX Stomp set up with my FRFR cab at our rehearsal space. As far as a guitar? Meh, it usually comes down to whatever is newest or close by as I am getting ready to leave. Often I don't even put them in a bag or case, lol.
If I am going to jam with others, I will bring my Bad Cat Cub IVR 1x12 combo for amplification. For a guitar, I'll often bring something versatile...something that can be a bit of a chameleon...something that won't step on the toes of the Strat or LP player. That is where the Brent Mason has become the weapon of choice. It is a guitar without any personal character, lol - in a good way. The guitar's tone just blends. It's great for those moments where there will be multiple guitar players, or just dense mixes. Plus, it is kind of ugly so no one really pays any attention to it!!!