A major is an undergrad. I think you mean get an AA from a Community College first and then go to the university for your last two years. Is this correct?
I don't think it matters. Personally, I chose to go to a community college to get my AA first. The reason is simple. I took all of my Calculus and Physics at the CC . The reason is because at the CC, my max class size was 30 students. When I took honors calc, I had 8 students in the class. At the university, Calculus and Physics courses are in stadium seating with anywhere from 150 to 300 students.
So, if you do not like teacher / student interaction and think you can teach yourself calculus and physics, just go to the university. If you would rather have smaller class sizes, more interaction with your professor, and more help available, go to a CC.
To top it off, each semester at a state university costs me around $2500. Each semester at the CC cost me about $700.
So, not only did I have smaller classes and personally feel that I learned more, I also saved $1800 a semester.
The only draw back to that method is there are a whole lot more immature idiots at a community college that arent really serious about school that you have to deal with. You may not have a problem with that but after being in the Marines... my tolerance for immaturity is zero.