My impressions of them are: If you can or want to code go with Gamemaker. If you like to drag 'n drop stuff go with Construct 2. Another one to take a look at is Stencyl, I think you can make games via code and/or visual node based editing with it. Some relavent TIGSource threads:…
Cool to see some other polycounters looking at Construct 2 - I've been using the past 6 months or more, compared to TGF / CNP, it has a similar intuitive interface, and is very quick in terms of bashing out prototypes. The chokepoint I've had so far is trying to find decent middleware to try ship stuff to things like…