The US bot is going to need a lot of modifications to be combat ready, but I think giving it more muscle and bigger guns is going to turn out well for them in the long run, not to mention the fact that its piloted by a team.
I can see the Japabot being subject to a lot of computer error, but at the same time its just a lot more sophisticated than the Ameribot.
Either way, these things are the future of warfare.
What a time to be alive.