chop saw with abrasive disk or metal blade?

[WSSix]

I'm looking into purchasing a chop saw. I was at the local Home Depot and they have a 14" DeWalt with an abrasive disk for $200. They also have a 14" Evolution with a metal disk for $220. I've never used a metal disk on thinner tubing like you'd use for exhaust systems. The box indicates it can do copper tubing but I'm skeptical. Has anyone used a metal bladed chop saw on exhaust tubing? How did you like it? How about thicker wall tubing compared to an abrasive disk? Any other thoughts concerning the two options you think I should be aware of?

Thanks