I just went through this exercise and bought 2 rifle scopes. But in the end I decided the single most important thing was reliability. I am backcountry hunting in awful terrain and need something that can handle the abuse I will put it through.
Anyhow, Rokslide is a Western hunting forum and some of their mods actually test rifle scopes for their durability/reliability. They zero it then drop it from knee and chest high a couple dozen times. Then check it again. Then they throw it in the back of the truck and drive everywhere. They test the scopes for about a year and 3000 rounds. Hardly any can hold a zero. I'm blown away by how many can't handle the ride in the truck.
Anything Nightforce, SWFA, and Trijicon makes seems to pass. After that it gets slim. Maven made a scope specifically to pass that type of rigor, the RS1.2 2.5x15x44.
So I bought 2 of these. The Maven mentioned earlier is on my .300Wby and a Gen II 3x15x42 SWFA that is on the 6.5 CM.
Vortex and Leupold have some great glass options, but they fail miserably in the zero retention testing. For my money, 250 in. I would spend $350 on a SWFA fixed power 10x42. When you get down to brass tacks, what is more important than holding zero?
Rokslide Scope Field Evaluations