There are two brands of scopes that I currently use that I would buy again. They are Leupold and Nightforce.
There are a couple of brands that I've never used but wouldn't be opposed to trying if the price was very good and they are Burris and Nikon. I don't have anything against them but given the choice I would go with something I had already tried and found satisfactory. I have used several Nikon cameras and lenses and have been very satisfied with those products.
There are two brands that I've used that I would never buy again. They are Bushnell and Tasco. Actually, Bushnell now owns the Tasco name. My gripe with Bushnell and Tasco comes from my experience with their warranty service. I had a Bushnell handgun scope on a handgun. When it broke and I sent it in, they refused to honor their warranty saying it had been "abused." I have mounted and used MANY scopes and the only abuse the scope had gone through was undergoing heavy recoil from a handgun which the scope was supposedly designed for. I think Tasco used to be OK but has been cheapened up; one of them that wouldn't hold zero cost me shots on 2 game animals. My Tasco/Bushnell experiences taught me that economy doesn't start with a cheap scope.