Again, I can't tell you which one to choose. I have both C2 and C3 licenses. I continue to use C2 because C3 still has too many bugs and issues. But I'm afraid, C2 is at the end of its life and Scirra might stop supporting it soon, so buying C2 license now is probably not a very wise decision. Also, Ashley announced that they are going to raise the price of C2 license (probably already have), as another way to promote C3.
You can try C3 for free, with registration you'll get 100 events, which is more than enough to test it and decide if you like it or not.
Check C3 General forum, there have been a lot of posts about the pros and cons of C3, for example: