From what I see, it depends a lot on your network.
If you want to benefit for fast reroute etc then you must go with RSVP. It also gives you the opportunity for next-gen multicast with "provider tunnels"
However the problem with RSVP is it requires fully meshed LSP's between all PE's hence you get the n-squared issue.
Some folks don't like this as it creates 100's if not 1000's of LSP's.
A nice alternative is large networks, is the P-PE connectivity is done with LDP, and LDP is tunneled through RSVP between P-P .
Therefore you have a very easy setup at PE-P level, whilst enabling Fast reroute between all P routers.
I would say, in a "small" network you may as well go with RSVP ... however if you've 100's of PE's, you may need to reconsider.
cheers
Sean