Can't comment on the Hope's...
... performance as I've never owned a set, but I certainly think they sure look nice.
I've been using Gustavs for my fifth season now, and have absolutely no reason to try anything different. They work: I never need to do anything to them and they stop - the way all brakes should: great modulation, fantastic power, and a control that you never need more than a single index finger to harness.
Add on the fantastic Magura Service, the 5 year leak proof warranty and the "mtbr Magura cult" and I think you can't go wrong.