best
1. US Optics...nothing else is even close
2. Zeiss
3. Schmitt & Bender
4. Swaroski
5. Nightforce


worst
1. BSA
2. Tasco
3. Bariska
4. Simmons
5. anyone of dozens of off brand, third world, POS scopes they sell.

Even if the cost of a scope is not linear when comparing cost to quality, the fact still remains "the best is still the best".