The Leica is a geovid binocular. To say which is "best" is hard for me to answer for you. I'll tell you what I use for different applications and why:
Under 400 yds for prairie dogs I like the eliminator on a 223 because of the ease of use. This scope does have limitations. Optics are not very good relative to other scopes in the price range. I contemplated going to this scope for everything but it isn't what I want for long range big game where low light situations are common.
Zeiss conquest 6-20 for almost every application. This scope has worked in every situation that I've used it. Again it has its limits: Internal adjustment and sub par turrets. Glass is the best I've seen for this price range. I started shooting the long range game with Leupold vx-3 and compared the glass side by side and the conquest was significantly better for what I want. Easy to get behind and I think the best value scope I've used for getting into the game.
Nightforce is the best all around tool. Good optics, excellent turrets great reticles and can also be used as a hammer if the need arises.
IOR is one that I'm personally enamored with. I like the elevation turret for no particular reason (25moa/revolution) I like the mp-8 reticle and in my opinion the glass is better than Nightforce. It seems to see through Mirage better than anything else I've used. With the 35mm tube it's heavy and should have more elevation adjustment than it does (52moa)
Swarovski I've had a couple and had no love for them. I'm in the minority here, most people love theirs. But for that kind of money it didn't appeal at all to me.
