The IMC will be fine too. I believe it's true 1/0, true to size. It's not oversized. It's not gonna be crazy flexible. But with two runs of their CCA you have 500a of current support. I don't know how many runs you were thinking, but it'll work.
Personally, I'd spend a few dollars more, and get some top notch CCA like so:
1/0 GA CCA Power Wire : 50 ft 1/0 GA CCA Black (Power_Wire)
It's at most, a $20 price point difference. You get more flexibility out of the AT, and you get more current capacity. Those are the facts. Then my opinion of it is, I like
Coleman and his products, and I'd rather spend a few dollars more supporting him. Also, he usually has a sale or a deal going on for CA.com members, he also may give you a little discount if you're going to be repping the product at shows and competitions and offer to do a good review on it. PM him and see what you can get.
But, if that $20 is a major deal to you, the Bullz or IMC will work. It's not going to deteriorate and turn to dust. Power will flow through it.