I have to say Conduit 2. While I didn't like campaign as much as the first (comedy instead of a serious/dark attitude), multiplayer is waaaaaaaaaay better. Being able to chat without sharing friend codes, using an actual headset instead of the WiiSpeak, and patches like once a week are especially nice. I was pretty much the only person who didn't cheat on The Conduit multiplayer (or at least who knew how to cheat, and chose not to). It was so full of glitches that half the time it would freeze.
Conduit 2 still has some bugs to work out, but they are working hard to fix them, and watching forums like gamefaqs and IGN for bug reports. This time there is an upgrade system, loadouts, and a store to purchase more weapons, armor, and upgrades.