When did they quit making the BGC slic? FWIW, I've got one of those that I modded to fit into a TTA. I really don't think you're going to see much of a performance difference between the two either way, both have large cores.
I will say that the BGC is relatively heavy compared to a stock IC. The end tanks are cast aluminum, but it's also probably not going to tear up it you hit something in the road with it. lol