I think if he wants a chance to prove himself, he'll sign with Buffalo. If Lynch is suspended for the first 4 games of the season, the two Freds will definatley split the carries. Lynch will then probably slowly be brought back into the system and won't be in full blown beast mode til atleast week 8. That gives Taylor atleast half a season to show he's still got stuff left in the tank.
If he goes to New England he'll be lost in the depth chart behind Laurence Maroney, Sammy Morris and Kevin Faulk. He'll probably get some carries in the first two weeks, but by then they'll totally abandon him. Not to mention, if Brady is back to 100% they'll be throwing the ball more anyway.
So if Taylor wants to actually play, he'll come to Buffalo.....if he wants to sit the bench and maybe win a ring, he'll sign with New England....simple as that.