A lot of people prefer triode operation over ultralinear for sound quality (smoother, less brittle sound), but the cost is lower output. I have only heard a few amps where such a switch can be made for a direct comparison and I don’t recall liking triode operation that much more than ultralinear. Again, give both a try.
(On a different amp) I was expecting to like triode better the UL, but that was not the case as the bass was thin. But the vocal were more airy in a nice way using UL.
(the beauty of a switch is it is easy to try it.)
Maybe another amp driving the woofers would be a thing for me to try.