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.
Here is an inexpenive and effective deer feeder I made recently.
No batteries to go dead, no hoisting it up in the tree, plenty of capacity, very easy to fill - so far, I love it.
I have made two of these and they are easy to build.
An empty 55 gallon drum, some 2x4's, some PVC tubing and fittings, a little bit of hardware and some paint - and you are ready to go.
I designed it so you can stand on the lower rung and fill it - the top is about 6.5 feet above the ground.
It holds about 375...