I actually have tried both, and you know, in the end, both kinda suck. The thing is that you just cannot get away without coating. It feels ok to the touch, but the minute you add a bit of moisture and rub, the ink comes right off. I'm convinced that you could actually wash a canvas to make it new again!
The Hahnemule I found also had some series defects... like craters! I never saw this when I just look at the roll, but once its printed, it is worse than any seed from a regular canas. I had quite a bit of pooling as well of the ink so I had these round circles all over the place. I've never seen this before so I didn't know to look for it until the 50 inches of canvas was used up. Now they did say to use Special 5 setting on my ipf6100 which would be the heaviest ink load, so I could probably dial this back, but I still wasn't impressed.
I think the BC printed nicer, less defects, but the ink rubbed off easier. Once coated, there really is no difference, so its a waste of money. The Hahnemule is very expensive, and although the BC isn't as bad if you order 3 at a time, I just can't see using this unless that slight bit of metallic pop you love and you can make sure the canvas will never need to be wiped down or touched.