Sorry, but have to give the Lawyer's Answer™: it depends on the circumstances.
For my main band that plays old school '70s style punk rock and roll, it's my Sovtek "Tube Midget" (sorry to any Little People) MiG 50H 50W head, with any number of cabs.
4x12:
2x12:
1x15:
But (there's always a "but"), I
also play in two sidebands. One does performance art/experimental, no drums. The other is a grrrl-fronted cover band. Both of these bands play far less loud than the main band. For those lower-volume bands, I
always use my Fender Super Champ XD (hybrid 15W 1x10), both in practice and for gigs. Sometimes for gigs I pair it with a second small amp for a bit more volume, most often my Marshall Lead 20 (ss 20W 1x10):
Since the 2 sidebands, at least together, play more gigs than the main band, and since I do use other amps for the main band (at practice at our drummer's we have a full backline so I use his Marshall DSL 100 into a 1986 4x12 cab, plus I've gigged
lots of other amps with the main band, most recently my Ampeg Reverberocket R212R 50W combo, but also my Fender Bassbreaker 18/30 2x12 combo and Marshall 3210 Mosfet Lead 100 head),
numerically over all the li'l SC XD gets played the most by far.