I have two Leupolds with CDS turret. One is on a .223 and another is on a 6.5 creedmoor. They both track well and have returned to zero every time after moving the turret. Clarity of glass is good. The thing I like best about the Leupold's is that I can line up on the target quickly. One downside on the Leupolds is the exposed turret can get turned off zero fairly easily while carrying in the field. I've had the same problem with a Nikon with exposed turret. I don't remember the exact price I paid but it was somewhere around $500 or $700 for the Leupolds.
I have two Vortex with Turrets. Paid around the same price as the Leupolds for them. Both Vortex track well and have returned to zero every time after moving the turret. I like the turret better on the Vortex because I can wedge the turret so it will stop at zero and the turret doesn't seem to bet turned off zero as easily as the Leupolds. The quality of the glass doesn't seem to be as good in the Vortex as the Leupolds. It takes me longer to get on target and return to target after the first shot with the Vortex than the Leupold. One of Vortex is on a 300 win mag and has taken a lot of abuse from recoil. The recoil on my 300 win mag has ruined the reticle on 3 other scopes.
I bought a Nightforce a couple months ago. I haven't had time to test it enough yet. My initial impression is I like the Nightforce better than the Vortex or Leupold. Besides the price, another downside to Nightforce is they tend to be "bulky" (many weigh around 30 oz). It wouldn't make sense to pay extra for a lightweight mountain rifle and then put a heavy Nightforce on it.
I'm not sure what brand my next scope purchase will be. It will depend on the function I'm looking for in the rifle. It might be a Nightforce or possible a Schmidt & Bender, Huskemaw, Swarovski, Zeiss or possibly a more expensive Leupold.
For a lightweight mountain rifle, the Leupolds with CDS are very good and for the moment would be my preferred choice. The glass quality is good and it is easy for me to get on target quick with them. Some the the Leupolds are lightweight which is nice for a lightweight mountain rifle. Leupold has a good reputation for being rugged and reliable. The Leupolds also have a lower profile than some of the others brands with exposed turrets. I would also consider Swarovski and Zeiss for a lightweight mountain rifle.
If you don't plan on shooting at more than 400 yards I think a BDC, mil dot or other reticle is better than a turret for hunting deer. Less moving parts on a hunting scope the, less likely it is to get turned off zero. This year I had the opportunity to take a quick 200 yard shot at a coues buck. The turret had been turned low by 2 MOA which caused me to hit 4 inches lower than I was aiming. I still got the deer but it required more than one shot.
Shooting beyond 600 yards with a clean kill on the first shot is beyond the skill level of almost all of the hunters that have a turret on their hunting rifle. It takes a lot of skill and a whole lot of practice to be good enough to consistently kill deer at 600 + yards,