I'm work at a "b" right now and wouldn't trade it for anything (only 3 percent owner, but I stand to inherit significantly more at some point in the future).

I could have really used the experience of an "a", but I hate the idea of being a cube-dweller. I'd probably be depressed. If you've got the experience of an "a" for a few years, cut loose and create your own destiny instead of being trapped in a hum-drum cube-land selling your soul to the company.