I’m a bit on the taller side, so when I’m at home I usually end up sitting as I don’t have a table that stands tall enough with out me bending over and killing my back because I can’t reach my gear while standing.
It’s different at gigs though, as long as the booth is high enough I’ll stand all night and rock out like no one else.
Both, mostly if I’m playing around when people are over I’ll be standing, but when I’m just auditioning transitions or playing a quick like 15 minute set I’m going to be sitting in my studio chair.