I used to use mostly Floquil a few years ago before my break in modeling. Now I started to use Pollyscale and really have started to prefer it to all others, mainly for the clean up and also the quick drying. I use rubbing alcohol as thinner and it is pretty much dry to the touch in a few minutes, so you don't get all the dust and such sticking to the paint. I also use ScaleCoat 2 here and there and are always impressed at how well it looks, just takes forever to dry. I normally use the pollyscale gloss when using the pollyscale paints for when I have to decal a model, gives enough shine to prevent silvering.
So more preference and what you are painting, some colors can only be had in certain paints so you must use that brand.