Over the years I have owned probably 30 scopes. Just about all of those were Leupolds ranging from older fixed power scopes up to 3.5x10 Vari-X3's... Quite a few of those were pre-owned.
Leupold makes a great product, but just as important they have incredible customer service. There scopes all have lifetime warranties, so it doesn't matter how many people have owned it, and their turn around time is usually 7 days. I like the fact that they are an Oregon company too. Their factory is only 160 miles from my house...
I have owned two Burris Signature scopes. A fixed 6 power, and a variable that I can't remember which magnification it was. Their optics were great, but their service sucked.... They may have changed it but back when I owned them, their anodizing was very soft, and didn't hold up well.
I owned two Nikon Monarchs. A fixed 4 power and a 3x9. Personally I think the Monarchs clarity is better than the Burris.
The one scope that really surprised and impressed me was a Bausch & Lomb 4000 Elite 1.5x6 that I bought for one of my 338's. This scope was made before Bushnell took over B&L.
I bought it as a test scope because I've owned older B&L products and was very happy with them.
The clarity was outstanding even though it had their Rain Guard treatment on the lenses. The workmanship was very nice, and the tracking and adjustments were the most precise out of any of the scopes I have owned. I don't know if they still do it or not, but back then another feature I really liked, especially on heavy recoiling rifles was that the reticle was screwed in place as well as epoxied.
I'm a little out of the loop now, but I tend to look at the companies customer service track record as well as the product itself.