Any good reasons to use transistor phono stage and line level preamp instead of tube ?

Sound quality is different. Not better, just different.
From a practicality standpoint, transistors trump tubes every day. Lower power, longer life, lower noise (usually) vs. tubes.

Is a particular transistor phono pre better or worse to your ears than another tube phono pre ? That's a judgement call between you, your ears and your wallet.

Best,
E

Tube phono stages are going to more susceptible to RFI if you are near a radio tower. In other environments maybe no issue, but when I lived 1000ft away from one, four or five tube phono stages all gave me trouble. SS phono stages all eliminated the radio signal that rode along with the music and could be heard between tracks and during quiet passages. For years I've stuck with tube line stages and ss phono stages and am happy with the approach. Cheers,
Spencer

 No tubes usually means less maintenance and no cost of replacing tubes when needed.

SolidState has more accurate imaging and more precise.
a well designed Solid state preamp,or phono stage 
if using very good parts quality thecapacitors resistors and a transformer based unit can sound very Tube  like and have lower distortion , but at a cost $$.  I sold both, Vacuumtube is less complex to build  and tubes has a more forgiving nature. Matching your speakers, cables, electronics has a Big say in final decision.

Transistor based phono stages are better for the aforementioned reasons and because they don’t produce even ordered harmonics, which while pleasing to many ears are a fault of tubes.