I also have never shot a bull moose. But From what I've seen I'd go as far to say a big bull elk is tougher to kill..
I won't argue that one way or another. I will, however, point out that "killing" and "drilling" are not the same thing. An elk may take more killing (read better bullet placement), but a big moose will certainly take plenty of drilling - and can stop just about anything one might typically try, certainly a moose can stop - not always will, obviously- any bullet you might shoot from a 308 Winchester.
