I have a tube and a ss preamp both of which I've had for quite a few years,driving ss amps.Knowing very well how each of them sound,Using a cdp source.
SS pre.-clearer treble & midrange noticeably sharper sound,more bass authority.
SS pre. with MF x10 tube buffer between the cdp and preamp-slightly smoother highs same bass authority.
Tube pre- fuller,richer,more pleasing sound,mellow highs a bit less bass.More to my presonal taste.Others might like the (slam of a ss preamp)