Personally, I would rate them
1. Zeiss Conquest 3-9x40 $389
2. Nikon Monarch 3-12x42 $309
3. Bushnell Elite 4200 2.5-10x40 $354
4. Leupold VX-L 2.5-8x40 $400
I have owned the Zeiss Conquest, Monarch, Elite 4200, and other Leupys but not a VX-L, and this is the order I would get them in. My favorite scopes are the Conquest scopes. I have 4 of them and love them. They have good optics, great mechanics, light weight, and are moderately priced.
I have a half dozen Monarch scopes and I am impressed by them. They have very bright and clear optics, good mechanics, and good prices. I bought a bunch of refurbished Monarchs and had great luck. I also bought a few when they changed magnification rates. When they are on sale or closeout, they are a great bargain.
I have had a lot of problems with Bushnell scopes and fogging in very cold temps. Enough that I will not buy another. It's off of my list.
I am also not a big fan of Leupold. While they have good optics and a great warranty, I have needed it far too often for me to pay that price for a scope. I have Kahles and Swarovski scopes that cost more but they hold up a lot better. I own 4 Vari-X III, a VX-III, and one of their handgun scopes. I am not impressed with them.