I am working to create a story driven 2d (2.5D maybe) Platformer (with a little bit of survival) and looking for some assets that will ease the development to a point, I could call “ASAP”.
(This question would be better placed in the Asset Store or General Discussion forum, since the Game Design forum is about design issues such as story building, balancing abilities, etc.)
Both kits are good. Check the feature lists carefully in case one offers something you need that the other doesn’t. Some people say Platformer Pro is easier to customize with scripting, but it also requires a little extra scripting to implement some of the features that are built into Corgi. Corgi gives you some more features out of the box, and it’s not too hard to customize with scripting either.
They both feel a little different to play. Thoroughly test the demo scenes to see if you prefer the feel of one over the other.
Also check the documentation and video tutorials for both. Your personal learning style might work better with one kit or the other.
If you want “ASAP” – that is, to start making your game right away instead of reinventing a platformer engine first – either is a good choice.