i haven't heard the xv 1t but have heard Koetsu Urushi, rosewood, black and the xv1s. Here are my personal experience:
xv1s- fast, detailed, big, bold sound, great bass but not the tighest. Very good presence
Koetsu house sound- warm, very midrange oriented, "personally hard to beat midrange", top rolled off, bottom end a bit loose. Very musical, truth to timbre, harmonics.
Both carts are very very good & it would be nice to have both carts in the same table w/ two arms.
If to get just one, I'd be having a hard time, but i think for an overall sound, the xv1s would probably what i would go.
xv1s- fast, detailed, big, bold sound, great bass but not the tighest. Very good presence
Koetsu house sound- warm, very midrange oriented, "personally hard to beat midrange", top rolled off, bottom end a bit loose. Very musical, truth to timbre, harmonics.
Both carts are very very good & it would be nice to have both carts in the same table w/ two arms.
If to get just one, I'd be having a hard time, but i think for an overall sound, the xv1s would probably what i would go.