Battle 1 has a poorly placed shield. Battle 2 has no powerups. Battle 3 has no carrots. I'm basing my judgements off of the assumption that levels are official as long as they are unedited. To remove the shield from battle 1 is to remove it's officiality, not that I am against that.

Finally, none of these levels have enough carrots IMO. I find that battle levels are most enjoyable with more carrots. Gameplay is a lot faster paced and you are forced to think much more quickly than if there are few carrots.

I chose battle 2 because you can actually have a normal game in it without making an edit.