I have the Bushy and Sightron in the milhash reticle so i can weigh in on those two.
Bushy -
Pros
bulletproof, solid click. I love the G2DMR reticle. Great glass
Cons
Little big and bulky
Sightron S3
Pros
Amazing glass, love the milhash reticle, cheaper than bushnell, slightly higher top end magnification (only useful for groups and load testing)
Cons -
It seems less durable than bushnell. It tracks very very well but when you pull the turret offthe inner setting of the turret is smooth as opposed to having teeth on the copper post. This SEEMS like a less durable design choice but it was made to ensure the your zero can line up perfectly as opposed to those whose teeth sometime force a misalignment of the markings. I have not had problems or even heard of them, but i think it is an inherent weakeness of the design