Paints from the two sets can be mixed with each other without any problems, so I\'d say mix and match. I have a VGC set which I\'ve supplemented with VMC.
But I think you should go the opposite ruite and start with the Model Colour set, because it covers much better, and it\'s a bigger range, with (in my opinion) more interesting colours. Even though it requires a bit more shaking before use than VGC.
I have a bunch of VGC reds and greens that I never use because they have such crappy coverage, while my VMC red covers completely with just two layers (even over a black base coat!).
I think you might be better off putting together your own set rather than buying a complete one, the money saved buying the complete set is offset by the fact that you\'ll probably be getting a bunch of colours that you\'ll never use. I think you should go out and get 10-20 colours to begin, learn to work with them, and then gradually add to this as the need arises. That way you\'ll get to know all your paints, and won\'t have a bunch of paints that you never use lying around.
I\'d recommend getting a good set of midtones and shades for the colours you want to use, a couple of different browns and greys, some skin tone colours, beige, ivory, black and white to start. Maybe some metallics also if you prefer metallics over NMM. Hope that helps.