I'm gonna take the wishy-washy answer and say both.
But in all honesty, I really like both styles a lot, and would be sad if you gave up either of them. Overall I'd say when you do characters the flat coloring seems to look a little bit better, while painting seems to produce slightly better results with landscape pieces. But as always, I've certainly got no artistic eye, so do remember to take anything I say with plenty of salt.
I voted non-decided cause this HAS to do with the content(not of this particular images but of the pictures drawn) in some a cases flat-colouring is the better choose and then there are also pieces which "need" to be painted. In your place I would colour the regular pieces flat and paint the ones which show the great felaryan landscape.
I like your painting style for landscapes and what not, but for vore and character drawings flat coloring looks much better. but then again it's your art and you can do it how ever you feel fit, i'm just tossing in my opinion.
I can't say I like one over the other. They both look great, but I will say that people/creatures look better in flat coloring, while scenery and landscapes look better in paint. Just my opinion,it's your art, do what you like.