^^ X2
For airbrushing I use Tamiya acrylic paint and Tamiya X-20A thinner 90% of the time. About a 50/50 mixing ratio. For me, nothing works as well through the airbrush. This stuff can be fussy to brush paint with though. Trick is to still thin the paint (maybe 25-33% thinner) and keep the brush clean, wet with thinner between strokes and don't "re-brush" the same area. Takes some practice to get the brush painting technique down but as PharmPony said^^^.
Enjoy putting your arsenal together...Definitely part of the fun!!