all of it is good in the flat colors... Acryl, Gunze aquaeous, Tamiya and the others that hobby shops usually have. Acryl sticks the best. Tamiya scrapes off the easiest. So, that is useful for battle subjects. Welcome to the world of stuff that cures fast.
For gloss, I almost never use any of 'em except Gunze. Usually, gloss is enamel or synthetic lacquer for me.