I am anxious to see the new ETR as well. I do have both Ares BTR 4.5-27x50 and Gen 2 PST 5-25x50 on hand and in terms of image quality and turret feel, PST Gen 2 is a bit better. It is also more expensive, so there is that to take into account.
Both seem to stay zeroed and adjust reasonably well, but side by side PST Gen 2 is a better scope optically. I expect ETR to be a better scope, so that should make for an interesting comparison.