Probably a slightly shorter travel bike than I have now. Or maybe longer.
Right now, I have a trail bike (enduro weapon, gnarpoon, mince tank) that in the last two years I have
-ridden DH
-ridden to work
-raced 100 km XC
-raced enduro
with nothing more than changing tyres and very occasionally pedals.
If my soul was shallow and devoid of life I’d even ride some CX on it.
I’d rather quit commuting and road riding entirely than have a CX or road bike be my only bike.