I use both interchangeably... although pretty much the only 4 I play these days is my Kubicki Ex Factor, which has the lever to drop the low string to D without changing the fingerings elsewhere.
Hard to get away without that low D for me, and I always find myself missing the low B as a finger rest for fast fingerstyle stuff on the low E.
Hard to get away without that low D for me, and I always find myself missing the low B as a finger rest for fast fingerstyle stuff on the low E.