The guard is no longer a weekend flying club. Heavies fly a lot and have more opportunities to get deployed. Fighter currency requirements will have you at the squadron 7-10 days a month. So, if you think you're gonna do 1 weekend a month and 2 weeks in the summer forget it. You'll also have 2-4 years of full-time training and seasoning in the guard before you become a "part-timer".

As far as the Marines, if you have to ask, it ain't for you. You had better want to be a Marine first before a Marine pilot because you will be, by default, a Plt or Co commander who happens to fly aircraft.

The bottom line is no matter which branch you try and fly in, you better want to be there to serve your country first. There's a lot of BS to deal with along the way and you will burn out fast otherwise.