I used to be a Redfield guy but that was back in the 60' and 70's. Eventually I realized the Leupolds had better glass than the Redfield and I switched to all Leupold scopes in the 80's. Since then I've had a lot of Leupolds but have only had an issue with one of them – which was an older 6.5x20 VariX III.
Now, I've got to say I baby all my rifles. I'm a hunter and a rifle of mine has only hit the ground once in my 77 years when I took a fall! That was with a Leupold 2.5x8 VariX III mounted and the scope was fine afterwards and held zero. Now I have a 3x9 Mark AR MOD-1 on an AR-15 and it's the least expensive Leupold I now own and it's not failed in any way! I've had Leupolds from a rimfire fixed power 4X to the newer VX-3HD 4.5-14x40 CDS and the only one that ever failed was that older 6.5x20! I feel I know why it failed!
Most scopes are built to take recoil, which is a violent jar of motion from back to front but aren't built to take a violent jar from its side! I had that 6.5x20 mounted on a relatively lightweight Kimber 270 WSM that had a fair amount of recoil and it did just fine until I put the rifle on the front of my ATV mounted crossways in those V shaped mounts that we see on ATV's and UTV's! I was late getting to my morning deer stand in the desert and the trials getting there were very rocky and I was in a hurry. After the bouncing along on those rocky trails the scope was dead when I first looked through it. Couldn't see a thing as it was totally black! Leupold fixed the scope without charge but my opening morning was ruined. However, there's more to the story!
Some years ago I had a very lightweight rifle built and everything I chose for the build was decided on light weight! To that end I mounted an inexpensive Leupold Ultralight 3x9 on it. It was one of the original Leupold Ultralights which I believe weighed about 9 ounces – so it certainly isn't a very robust scope! I've had that same scope mounted on that rifle for about 30 years or so – and carried that rifle/scope combination on the same ATV in the same area's that killed the 6.5x20 – and the scope has never failed. Every year when I take it to the range to check its zero before deer season, it's always exactly where it was the year before. It's never once lost its zero from where I set it 30 some years ago! The scope doesn't have the best glass as there is a noticeable difference in glass quality between it and the newer 3x9 Mark AR MOD-1 but that old Ultralight has never failed and it's taken more bouncing around than about any scope I've ever owned!
Since I've gotten older, I've always chosen my scopes based on light weight – which means a Leupold! This discussion may change that because as mentioned earlier by others, lighter weight means less robust – which would also include the internals and not only the tube itself!
Right now I'm leaning towards the Trijicon and Nightforce scopes but can't really afford the Nightforce I would want and since the Trijicon seems to do well in the "Rokslide Rifle Scope Field Evaluations" and they're lighter weight than the Nightforce, I'm now lusting for a Trijicon Credo!