Man, they're both looking great! But IF I have to choose, I prefer the flat colouring. It gives a slightly 'cleaner' look to me, maybe a bit easier on the eye, hard to explain. But I love the painting style too. The painting style may lean more towards 'photo realistic' if you will... but you don't always need to aim for realism to have great art, you know what I mean?
Good luck with your art, no matter which colouring job you will pick as 'standard', I'm in awe and can only WISH I could approach that great result myself!
You really masterd your flat collouring, so yeah thats really one of your strong points. Combine that with vore and you get to create epic vore master pieces. Your painting is good too really! But painting takes away alot of details.
But as always this is your choice, whatever you feel more comfterable drawing with is your thing to decide, though im pretty sure that your flat collouring looks alot more detailed and nicer. Especially the vore, gotta love vore
The painting is by far the more impressive-looking, but I have to say, it's the relative simplicity and cleanliness of the flat coloring that has more appeal, when matched-up with your usual style. Definitely keep doing both (as if you weren't already planning on it)! But by just a tiny margin, my vote is on the flat coloring.