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I think it's a very well balanced, well designed and very engaging layout.
I have a small remark: Boxing is about close contact with your opponent, looking him face to face. I think it's more logical, more engaging that on the front, the boxer (aka your opponent) is facing to you, as it is on the side of the box.
Other than that, it's good to go!

Thanx,
I wondered about this aswell, but all the feedback i've received people seem to be slightly in favor of the back side. The reason people prefer this, is because the game puts the player in the roll of the boxer. You are not looking at your opponent, you are looking at yourself.