I've owned both Nikon and Leupold glass over the years and never had a problem with either. Although, I believe the Leupold glass has a slightly sharper image. Admittedly, this point is arguable.
With that being said, I do own a pair of 10 x 42 Leupold Olympic binoculars. They are very rugged and hold up through a lot of abuse (or shall I say hard use.) The only thing I might change about them is the eye piece. I believe the design could use some improvement in that aspect. The eyeglass vs. non eyeglass wearer portion gets worn and gets to the point where it moves in and out too easily.
If I had it to do over again, I would've bought the Nikon's, but that is only provided they had a more robust eye piece than the Leupold's. The best way to compare is by visiting a sporting goods store and checking both of them out.
For most on here there is a dream trip floating up around in their heads but there is a question of how to pay for it. This has been a problem for all hunters that wish for that elusive moose, bear, goat, sheep, elk, deer, or any other hunt where you are required to hire a guide or you choose to hire one for that hunt of a lifetime.
First off I am not a financial planner I am just a hunter that learned a long time ago that even with a great job there are going to be some...