From my experience I have noticed this
Teardown and cleaning is different from airbrush to airbrush.
My Aztek A470 never quite got clean, even after flushing. There would always be a little residual paint in the nozzle assembly somewhere and it usually required either teardown or soaking. This led to 2 nozzles going bad on me, probably from being damaged some time ago (I bought it when I was 14, I'm now 26). I don't use the 470 much anymore, but now I know to try and avoid disassemblying the nozzle assembly anymore than I have to. So MikeV is right on this one.
My Badger 200's usually only require flushing and maybe removing the needle and wiping it down with a cotton swab dibbed in lacquer thinner. I will usually tear them down after a paint session but not always. In my experience, paint doesn't stick well to the metal which makes cleaning much easier over the Aztek.
As far as acrylics and enamels go - I use enamels. Why? Lots of variety of colors to pick from (ie Federal Standard, RLM) and they are easy to touch up, etc. Also, it would cost me hundreds of dollars to convert over and frankly thats kinda expensive. I also have not had any issues with clean up, just don't hang out near an open flame and wear gloves or a mask when needed.
I do use Future as my clear coat and it works quite well over any properly cured paint. I am also considering getting some Tamiya flat base to use with the Future as well because I think it would be cheaper than buying the clear flat lacquer.