I'm in the Rory camp. I would much rather play any way other than using an arranger. But, that's because of the pure pleasure of "trading fours", responding to innovative lead lines played "on the fly", etc. Of course, that free form sytle of playing works only at limited venues; mostly in a jazz setting (at least for me).
The most satisfying thing I do is play piano and guitar in a trio format with my son on bass(electric upright and bass guitar) and my grandson on drums. Next is C-1 or B-3 with drums and as many other superior players as the gig can justify (read money). Next is playing as a sideman on guitar, bass or keyboards. Then (and this is still enjoyable) is using an arranger with added players (guitar, horn(s), percussion, etc.). Last is a solo gig with or without an arranger. Really don't enjoy that much. Playing with other players is what it's all about for me.
Russ