I've used both Clickteam and Scirra software extensively for years and the truth is both engines are better than the other in different ways. Also, both of their successors are coming out soon so there's little point in debating which is better than the other (the answer is "it depends on your project and skill set", anyway).
As of this moment, C2 is the better option because it's easier to pick up and your game can be moved right on over to C3 once it launches since it's just a new editor.
Fusion 3 on the other hand is a complete rewrite so anything you do in Fusion 2.5 will have to be remade in it (they are providing a F2.5 > F3 converter, but it will be limited.) It's also got a higher learning curve so by the time you really get the hang of it Fusion 3 will be out and you will have completely wasted your time lol.