Audio research ref 6SE vs world

Which tube or SS line stage do you like as much or more and why? Any cheaper options that you actually preferred?
Seems like arc and vac are AMONG the best tube production linestages.

^^ fify ^^
Just heard a friend’s Allnic M3000 or something tube preamp and it was really nice!  Thing weighed over 50 lbs and had terrific bass and clarity.

Nobody mentioned Allnic yet so here you go.
I would love to know if anyone has opinions between the Allnic L3000 mk2 / L4000 and the AR REF3 preamp.