Here it is in a nutshell.
Skelton is a big,immobile, stand in the pocket QB. In todays NFL if that is what you are you need to be deadly accurate and have an uncanny knowledge of the game and defenses.
He is neither. For every 3 good passes he throws he will throw 3 inaccurate ones. He may develop mentally, but you can watch a guy like Luck and see how farther advances he is compared to Skelton. Skelton ceiling isn't very high.
Kolb is smaller and can be skittish at times. He has a certain amount of mobilty and is somewhat accurate when given time but has durability issues. Again, in todays NFL a QB like Kolb will make you cheer and then piss you off in a matter of minutes. His ceiling is a bit higher than Skelton because of his ability to move and his accuracy and he has had a limited amount of "playing" experience.
The way this team is built Kolb definitely is the better choice. Both guys would be better with improved line play. But neither will ever be a dominant, put the game on my shoulders QB.
This not about who I like the best. It is only my opinion.
I only hope that even before we look for a QB or a RB we would invest everthing we have into improving the o-line. Draft picks, free agents, coaching..the whole shibang. Until that happen we will forever be a hit or miss offense with no true bread and butter. We can't run with any authority or consistency and neither QB is capable of strapping the team on their back.