Generally for reservists who are airline pilots, a double commute is a bad idea...ie you want to live at either your airline domicile or your military duty station. You do not want to have to commute to two different jobs, especially if you are married.

You can use your jumpseat/nonrev privileges to commute, although there is always some risk that you will be late on occasion. But guard/reserve units usually understand that we need some flexibility, so it shouldn't be a problem if you are generally reliable.

There is a remote possibility that you could "non-rev" on military airplanes to/from guard duty (Military Space-A). But this is not as easy as airline non-reving, and is even harder for guard/reserve. Basically you would need a daily milk run between your home town and guard unit city. Even then, you can (and will) get bumped off any time, any where. Best to stick with the airlines for that.

If you live close to your base, you may have more opportunity to pick up extra drills...or you might get sucked into that whether you want to or not. Of course the same can be said of airline domiciles, but I would rather live at my military duty station...it allows me to be more of a participant in the unit, as well as a go-to guy.

You can switch guard/reserve units, but there has to be an opening where you want to go. In the reserves your commitment can be fulfilled at any reserve unit. Not 100% sure about the guard, but I think that is true for them also.