First off, both excellent choices. Secondly, I find Global to be in between Storm and Brunswick in terms of angularity.
Now, here's the question. How much angle are you looking for? Covert is going to be the smoothest out of them all, handling more oil. HB is going to be a ball to use when you need to step in and get some angle. Black Ops is in between those. Oob, flippier than the Covert, less flippy than the HB.
Only suggestion is to put your own surface on either the HB or Black Ops.