These are my two favorites. Played DR's for many years then changed to R Coccos when I felt I was getting to many new bum strings in the DR packs. Played the Coccos for a few years then they became impossible to find in the US so I went back to DR.
The feel of both is extremely similar: both seem to use same diameter outer wire, both have nice bright top ends, and great growly stainless tone. Once they settle in after about a week, they both stay similar, but the R Cocco has just a hair more bounce in the mids.
I dont have acidic sweat nor do my hands sweat while I play, so strings last me a very long time; DRs can last me 6-10 months, the Coccos were about 4-5 months from what I remember.
I'm starting to feel the qc at DR is slipping again and am hoping R Cocco gets their US distribution going soon, I'll want to switch again.