For the roundwound strings, I'd have to recommend D'Addario Pro Steels EPS165's. Long lasting, bright sounding, and (IMO) really suit "mid focussed" basses (Ric's, Wal's etc.).
Haven't tried a 6 string (to be honest, I don't particularly want to).
Haven't tried an Octave Course 8 string (tbh, I really particularly want to!)
Wouldn't mind trying a Wal and a multi-scale bass.
To be fair, the "solves a problem I don't have" is pretty much the reason for purchasing any new bass related equipment.
And probably the main raison d'etre for BassChat.