Got me thinking a little bit..... I think in most OD pedals there is a touch more compression than the EHX, and I hear a "Zhuh" kind of sound whereas the ERD is a little more organic? Coming off chugs giving a snarly "Chonk" kind of "Goawrrrrr" nuance thing that I can't find anywhere else. That's the reason I use it both home, studio, and on the road pretty much exclusively. It's a nuance thing.
I also have decided that when I play in std tuning or drop D, the differences are less significant. The 805 is perfect for that, as are many others.... But as we almost exclusively play Drop B now, the differences in OD pedals, strings, pickups, speakers, all stand out more prominently. That's my own opinion as far as my own tone goes anyhow.