The look of Oakmont today is certainly much closer to its early days than Pine Valley is. If better means closer to the architects original, then I can see how one can argue for Oakmont.
The early photos of Pine Valley are stunning. I agree that the trees don't affect play too much at Pine Valley but it has completely changed the look of just about every hole.
I haven't played Oakmont; It seems like Pine Valley is more fun to play. As difficult as Pine Valley is, it seems like Oakmont is tougher. At Oakmont it seems like if you miss their 25-30 yard wide fairway, its a 0.5 - 1 stroke penalty. The penalty is probably the same at Pine Valley if you miss a fairway but their fairways aren't as narrow, which I like.
For those that have played both, is Pine Valley more fun to play than Oakmont?