I switched almost exclusively to acrylic paints several years ago and, once I got the hang of them, I could safely say I'd never go back to enamels.
The key to how well a paint works in your airbrush depends on what you thin it with. Some brands aren't particularly picky when you thin them, yet others are formulated in such a way that you pretty much have to buy the specialized airbrush thinner made by that manufacturer to get the paint to thin out and spray decently.
I've had very good success with Testor Acryl paints thinned with distilled water. Pactra also works very well thinned the same way, but its nearly impossible to find anymore as far as I know (pity, it was one of the best acrylic model paints in my opinion)
I've had very limited success with either Tamiya or Gunze Sangyo paints being thinned with anything outside their specialized thinners.
I can't speak for enamels as I haven't used them in some time, but I imagine similar logic applies to them as well.
Good luck!