Re: CC 3 -

Advantage: Good-looking maps from the beginning if you follow the tutorials

Disadvantage: SOme feel that CC3 can be more limiting than other programs because it "shunts" users toward certain styles. This is certainly not an absolute limitation - CC3 can be used very creatively.

Disadvantage: I personally feel that the interface of CC3 is non-intuitive and frustrating. Possibly more significant in the long run, you may eventually want to broaden out into other realms of digital imaging (I started off in heraldry) - the concepts and techniques you use in other graphics programs will be potentially a LOT more useful than CC3 later on.

But this is all, entirely, from my perspective and opinion only - and in no way a knock on CC3 for anyone else - it entirely depends on your needs and preferences.