Raze is way better I think. The only thing witch is better on armor mayhem is the way you can buy armor. I hate the fact that you have to by guns also Raze has better graphics, beter gameplay and better story/missions but I do like the stealing computer date game mode on armor mayhem.
I prefer Armor Mayhem, especially because of the map editor. Now we need more weapons and levels. One of my old favorites from Louissi was Smiley Wars. Glad to see him return to side-scrolling shooters.
Both the games have good and bad things, but my final vote goes to raze. I think raze have a far better storyline, better musics (but this is just my personal opinion because armor mayhem ones was cool too), more different weapons, but over all, armor mayhem is much easier, and the only challenge factor is the time, and I don't like to hurry in that kind of games.
I think Raze is better because Raze has awesome weapons and helpful stuff like x2 damage or invicibilty and for Armor Mayhem, I don't really like the weapons and It's easier.