Preparing to be shot down here, but here goes...
In my opinion, Pants is our only out and out goalkeeper, Hart is not. Hart has admitted himself on more than one occasion that he 'doesn't know football' (paraphrasing of course) but in way of tactics, formations and build up play Hart is very out of place and isolated. As a youngster, Hart was a very talented cricketer and could well have made a decent career out of it. What Hart does have going for him though, is his immense agility and reflexes allow him to pull of the wonder saves that have bought us so many points the past few seasons. However, to me that is like an outfield player who is blessed with pace and a good shot, but nothing more. Eventually they'd be found out wouldn't they? I also think Pantilimon organises the defence much better in the absence of Vinnie. Just to clarify, I think that they are both good keepers who possess their own talents which warrant a place in our team, but I'm not sure either are our long term option.
Final thought- would much prefer Hart if he knuckles down and ADDS to his game as well as improves, as he is Englands number 1 and for the years of service he has given us. And there is plenty of time for that to happen, it's all a question of attitude now.