I have both, the PMDG and the wilco 737. I must say they are both pretty good. both have their pros and cons. So I guess it is more a personal favorite.
I really do like all PMDG products a lot, they are realistic...
Flight caracteristics? well, I flew classic and NG
in real life and nothing is comparable to Flight Sim at all. But if I had to chose, I'd say the wilco is a tad better.