B&M has perfected the zero-G roll... it's the best inversion there is and it's usually (for me) the highlight of whatever ride has it.
The one on LZ-TR is pure sex, just smooth and floaty and purely weightless. The one on Alpengeist is wild because you can actually feel some lateral force as well as negative g's.
Anyway, that's my favorite element, but I think the most intense inversion, and the coolest looking, is the cobra roll, the way it messes with your inner ear.