The stats that have been cited in this thread don't tell the whole story. There are other stats and facts to be considered.
Crawford has been a very consistent player for much longer than Werth. In fact, he has almost twice as many career ABs as Werth and he is 3 years younger than Werth. In fact Werth has only had 3 seasons worth discussing.
Until 2008, he was a part time 4th OFer type. Since 2008, he has been blending into the background on the best offensive team in the NL. They have Utley, Howard, Rollins, and Burrell (in 2008). In 2008, the all-time great, Pat Burrell had a better season. I am sure he is available at a much cheaper price than either Crawford or Werth.
Werth's power stats have been inflated by playing on the best NL offensive team that plays in a bandbox.
Managers do not go into a Philly series saying that they don't want to let Werth beat them. Managers in the AL know that the way to beat Tampa is to keep Crawford off the bases. That's the game plan, and it has been the game plan since Crawford has been in the league starting in 2002.
At age 28 with twice as many career plate appearances as Werth, it can be argued that Crawford is just entering his prime. I'd much rather offer a 6 year contract to Crawford than a 4 year contract to Werth. In short, Crawford is a superstar with superstar skills. The choice isn't even close IMO. His speed and base stealing ability alone is a lethal weapon that few in the game possess. IMO if Crawford's agent doesn't get him 50% more than Werth, he is a quack.
This debate really does remind me of the 1977 choice between Joe Rudi and Reggie Jackson (although Jackson and Crawford are very different types of players). One went on to the Hall of Fame and the other is largely forgotten. That's how I view Crawford and Werth ending up.