I have better average returns with OF-105 on Eudoria than anywhere else. That said, most of my hofs/globals have been on Amethera.
Some of my soc mates disagree, some agree. I think it all depends on skills+finder+location+duration of run+what you had for breakfast+how long you middle toenails are+time+luck. It is different for everyone, you just have to find what works for you.
Here is a tip: After a particularly good run, record everything you did. Finder, skills, amounts of bombs/probes dropped, everything. Repeat a few times over the course of the next week. If it keeps working for you, don't change it. Some people like to chip down after they have skilled up a bit, so they can get back into the zone of everything that works for them. It may take a lot of trial and error, but eventually you will find what is best for you.