This is a good list. For LR you need clarity, reliability, and good low light capability. I haven't had the opportunity to use the ZCO, but my wife has a Premier (forerunner to the TT), and I have a S&B PMII 5-25. The S&B is my favorite and meets all my criteria, and to my eye is better at last light than the PR, this is subjective based on the scope and a person's eye. I wish the PMII weighed less, which is why I ordered a Polar for my hunting rifle. Less magnification range and less ability to dial than the PMII, but more than enough for my 338 WM or 6.5 (or a 7mm if I build it) to go as far as I'm willing to shoot.
After a Leupy let me down on a shot about 15min after sunset, I haven't been a fan. I couldn't see antlers at 250 to tell which buck to shoot. I could see the antlers through cheap bushy binos, but couldn't see anything resembling antlers through the scope.
For me the best, is what you can afford that give you the most time after sunset where you can still see to make an *Rule 1 Violation*al shot.