When I was getting back into modeling this summer and getting the bench all set up and whatnot, I had every intention of choosing one brand of paint.
Yeah.
Just a few months in, and I'm all over the map. I've got enamels, alcohol-based acrylics, water-based acrylics, and a few lacquers. It really depends on what you're going for...but I've come to the conclusion that there is no one perfect paint brand that encompasses airbrushability, brushability, low toxicity, ease of cleanup, etc. Every paint is a compromise and it's a matter of picking the right tool for the right job.
I'm far from an expert, but here are my takes on the paints I've played with so far:
Testors Model Master Enamel - Tried and true. Brushes pretty well. Airbrushes pretty well. Cleans up with thinner, mineral spirits. Very good selection of colors. My paint of choice for drybrushing, hands down.
Testors Model Master Acryl - Used it once and threw it away. Some people love it. I'm not one of those.
Tamiya - Use it for airbrushing only. I thin with either their lacquer thinner or Gunze Mr. Leveling Thinner. Both work well. Mixed right (in my case about 2:1 thinner:paint), with the right air pressure and distance, it's like spraying silk. Color selection is wanting, however.
Lifecolor - Good color selection. Brush paints well. Airbrushes like water, and not in a good way. Very thin paint that still manages to clog the brush if shot without thinner. Only way I ever got it to work was to build up coats in 7-10 layers. Also has very poor grip on plastic.
Vallejo - Brush paints wonderfully well but dries out fast. Mixed 1:1 with Future, it airbrushes beautifully. You might face tip dry issues if you're spraying for a long time, but a wet q-tip fixes that. Great color selection but, in my experience, poor color matching with listed FS numbers.
Gunze-Sangyo Mr. Color - Awesome paint. I use their Mr. Surfacer as a primer, and sprayed some Mr. Color orange-yellow on my recently built Wildcats. Very impressed, even if it has a very strong smell.
White Ensign Colourcoats - Picked up several tins for the two Soviet planes I'm building, but I haven't cracked them open yet. Still, I've heard pretty glowing reviews, so I'm hopeful.
Best of luck finding the paint(s) that work for you.