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

I see & hear in my system no good reason to; why? I have tubes in my Phono Pre, CD player & in the preamp section of my Hybrid Integrated. SS takes it from there in the power amp section of said integrated. It is the best of both worlds & after much trial & error, I wouldn’t have it any other way.

Positron tubes are hard to come by. At least, harder than PNP transistors.

So I thought - no good reasons. More funds and effort, that's all.
frogman, you are a rare guest outside that music thread.

But at the highest level, what can compete with tubes, Gryphon/FM Acoustics and other Swiss ? Who else ?

I'm in the middle of a amp test drive at the moment. The test is not to choose between tubes or SS. I am a fan of both but tend more to favour tubes. I agree with some of you in here that you today can voice a tube amp to sound as a SS and the other way around.
inna: I have a Kinki Studio EX-M1 integrated for test - this is a SS that compete with several amps priced to cost many many times more. I'm impressed of what this amp deliver or rather do not deliver - because it is pretty hard to define it's signature sound other than neutral. I know that they have a preamp to that use a lot of the same technology and some extra features.......this amp or pre amp could be the answer to your question. Rgs M