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.