It really depends on your class and build. Every build has its own specialty.
In general, you need a farming strategy that’s tailored to what your character does best. Your efficiency basically comes down to how many mobs you can kill per hour.
Making broad generalizations doesn’t make much sense.
For example, trying to farm Cow Level with a FoHdin won’t work, but for a Javazon it’s S-tier.
Chaos Sanctuary is S-tier for a FoHdin, but pretty bad for a budget Nova Sorc.
Countess runs are S-tier for a Nova Sorc, but you wouldn’t want to do them with a Hammerdin.
Same idea with other builds…run Travincal with a Zerker Barb, etc.
The point is: pick farming spots that match your build’s strengths.