This is probably a trivial complaint to some, but after using a Precision 5510 for a while I really wouldn't want to go back to a laptop screen with a wide bezel again. It's up to personal aesthetic choice, mostly, I guess.
edit: It's also unclear whether the SSD in the ZBook is PCIe or not. It isn't stated, so I assume it's not, as PCIe performance is a differentiator.