Jessica Simpson or Nick Lachey: Whose Relationship Will Last Longer?

Nearly five years after Jessica Simpson and Nick Lachey divorced, both stars got engaged this month and are totally ready for their second marriages.
Nick and Vanessa Minnillo announced their news November 1. Then, this Sunday, we learned that Jessica Simpson and Eric Johnson will wed as well.
The way marriages go nowadays, particularly in Hollywood, you can't help but wonder if either will make it. Who do you think stands the better chance? 

Nick Lachey and Jessica Simpson are getting hitched. To other people.

As for the obligatory rumor that Jessica got engaged just to "keep up" with Nick (you know someone will report this), a source says Johnson "had been planning the engagement for awhile and the date was very special to them."