I searched this site and Audio Asylum for loading recommendations on the Benz Ruby 2 and I found recommendations for 100ohms, 47,000 ohms, and pretty much everything in between. I was hoping for a short cut too, but no such luck. There wasn't any one magic value that everyone preferred...they recommendations were all completely different. You may have to spend your time experimenting after all.
I've found that the different values all have their pros and cons. I've found that I prefer the 100-200 ohm range in my system (Linn LP12 w/ Ekos arm thru a modified Counterpoint SA-5000 phono preamp w/70s nos Mullards). There are some recordings where other values sound better, but I find that range to be the most comfortable for my system and ears.
I've found that the different values all have their pros and cons. I've found that I prefer the 100-200 ohm range in my system (Linn LP12 w/ Ekos arm thru a modified Counterpoint SA-5000 phono preamp w/70s nos Mullards). There are some recordings where other values sound better, but I find that range to be the most comfortable for my system and ears.