What's the best Call of Duty & Ace Attorney on the DS?

[Gintoki]

The third Ace Atorney is the best, however they are all linked so get them all.
COD online mode on DS isn't bad, the gameplay is good...only four players before, so I suppose COD WM2 DS too...for COD I would say get COD4 Modern Warfare; but it's the only one I played on DS