I'm in the Sig camp.
Using both Leupold and Sigs out to 1500 yards, the Sigs were faster and more consistent on multiple range repeats on the same target or terrain feature.
I have one Leupold that hasn't faded, and multiple Sigs that are going strong.
Sig had a rock in the 1700-1800 yard line-up, can't remember the exact model - but it consistently wouldn't range to it's max limit, more like 1200 yards.
Sig 2200 and up - have been great, and easy to use.
YMMV
