Honestly it's kind of a toss up and boils down to personal preferences and which will have the better pice point for you. Both are great optics and fit the bill for DM/Urban Sniper, along with the S&B PMII 5-20 those 3 are my top recommendations for professional clients. If I had to pic the Mk6 with the Tremor 3 wins out for me personally due to weight, low-light performance and price point (LEO/MIL).
Would you say illumination makes a big difference for the tremor 3?
ATACR's are in the for sale section all the time for $1,800-1,900. At that price, the ATACR is a no-brainer. It's one of my favorite optics.
Think milR, milC or Tremor 3? For a gas gun not a precision rig
The kahles k318 is coming out...with the skmr3 is very interesting but also comes in at about 33oz. Thoughts?