No doubting his talent (which will bring him his fair share of titles and the money that goes with it)but to me the putter seems to be what could hold him back from being the man to topple Tiger.
Can't fault him for playing both tours when the world ranking points are stacked in favour of the US Tour players.
I agree with his decision as it will develop him as a golfer and he only has to play a couple more competitions over there anyway.
If I had a decision between the Euro and the PGA Tour I would pick the PGA. Not only because its in the US (class country btw! ) the PGA also has bigger events and the courses are perfect and also a lot of the really good players play there.