I have had both.
The Pace i had was the gold legged pro-class in the 90mm variant. I found them to be fairly stiff, looked very cool, but in all honesty i found them a little dare i say too plush (even with the right spring).
The Z2 Superfly's were brilliant, very stiff, nice and light, but a little low on travel. They tended to ramp up a little quickly for my liking. On the plus side the damping in the Bomber was awesome as it always was in the older Marzocchi forks.
I would go for the Bomber as it is in my opinion a more confidence inspiring fork, and required a hell of a lot less maintencance than the Pace.
Hope that is of some help to you, cheers Mike