I personally chose the 8x magnification over the 10x magnification because of the almost impossible task of holding a 10x power mono/binocular steady enough to see anything WHEN used without a tripod of some sort. Actual field of view had no bearing on my decision. To me, it came down to getting the strongest mono power I could hold steady WITHOUT a tripod or support system. I went to Cabelas and I tried out all of the different powers available in both Monoculars & binoculars, and then I tried the different objectives as well. 8x power was the best I could hold reasonably steady, and that lined up with my research. I was hoping I could hold 10x steady, but it was a joke. NOT even close NO matter how hard I tried!
25 objectives were OK, but 36mm seemed a hole lot brighter, so I settled on that compromise.