Well lets compare Vac., Skil, Greenedge, & Europecar
Vac - easily strongest: Feillu is a great sprinter, he may not be as fast as Kittel or Degenkolb, but he is constantly up there. Van Hummel is another great sprinter. Leukemans, Marcato, Westra, Poels, Devolder, & De Gendt are all great attackers. De Gendt & Larsson are both great in the ITT as well. (according to NICOSIX, they are 10th for next year, right after Quickstep & Movistar.)
Greenedge - 2nd: Goss, obviously great sprinter. Greenedge has quite a few good riders, but to me, there is hardly any variation in the type of rider they have signed. So many sprinters (or former sprinters) and NO climbers. They should make things interesting however. (NICOSIX has them 14th, right after Astana)
Europcar - 3rd: Voeckler, Rolland, Charteau, Kern. All great riders. Kern & Rolland can climb, Voeckler can attack like crazy, and somehow Charteau just sometimes gets lucky. They don't have much of a sprinter though... Chavanel? They do makes things exciting though. (NICOSIX has them 20th, mostly from Voeckler's points though)
Skil - I really don't understand the hype... Kittel & Degenkolb are both great, but they really don't have anyone else...Dumoulin & Geniez both have a few points, but thats about it. I don't see them as very competitive. (NICOSIX has them at 23rd, behing Colnago... I don't think there is any hope for them)