Another zombie thread!
I can't believe I missed this the first time around.
I have several brands that I brush by hand. That doesn't mean I don't use an airbrush to apply them, either.
I use Tamiya's acrylics, thinned exclusively with Tamiya's X-20A acrylic thinner. It took some trial and error to arrive at that combination, including trying water, and isopropyl. When I started airbrushing Tamiya acrylics, I used X-20A to thin them, then tried it with hand-brushing. Gone were the issues in which the paint clumped, or subsequent coats pulled up earlier coats. I can lay down the paint by hand, as thin as if it were airbrushed. Just can't use Tamiya with my wet palette.
I use Vallejo's Model Color, and Andrea's, both water-soluable acrylics, and both formulated for hand-brushing. I also use Lifecolor's water-based acrylics. And I use the craft-store water-based acrylics: Apple Barrel, Americana, Folk Art.
I use all of those on a wet palette, for consistent thinness, and because I can save a batch of colors from one session to the next. Very convenient.
And I hand-brush enamels, particularly Testor's enamels in the little glass bottles, and my dwindling stash of Model Master enamels.
I also have Model Master acrylics, and I use isopropyl to thin those for hand-brushing.
I don't bother with other brands, because my current stock will last me till I die. No need to change-unless there's a brand out there that you open, and it magically covers the work to an award-winning finish.