[quote name='Rex']Ghost Squad is a pretty short game, while HOTD contains 2 games in one that are a bit lengthier. Ghost Squad only has 3 missions which level up opening new paths and ways to go about the missions, as well as unlockable costumes and weapons (and WIFI leaderboards).
Personally, I've put more time into Ghost Squad and have more fun with it. It's a good game to throw away 30 minutes while you're waiting for something. The game is also $20 in the bargain area of Zellers.
[That totally sounded like some PR][/quote]
Eh, its not too PR. I'd tend to agree though, both games are a good choice but Ghost Squad is really fun. Better yet, pick up a couple Nyko Perfect Shots or use the Zapper and the game is soooo much better. HOTD is really good too, and as Rex said it is a bit longer since its two games in one. You really can't go wrong with either, but my personal preference is Ghost Squad.