Skarmory is a very good setter and very good defensive wall. Ferrothorn most of the time only has spikes or stealth rock not both so he can carry leech seed and protect. Ferrothorn is also a mixed wall, so his individual defense stats are lower, but they are both still good. As opposed to Skarmory, who is only a defensive wall, but has one of the highest defense stats in the game. --- PSN-block-man-x / SSF4 Main Vega.
For Support and Whirlwind spamming, Skarmory. For Stalling and Iron Barbs, Ferrothorn. --- Mentions of Zangoose since 6/27/2013 as of this post: 36 Official Shadow Zangoose of the X board and Salamence of PGD!