Preamp tubes... Psvane or Genelex?


I have a Belles VT-01 preamp that uses 4 12AU7 tubes. I was looking for a tube that will last a long time and have good dynamics. Since they can't be returned, "buy and try" does not work with this, so I am polling the audience. Any opinions are appreciated... thanks.
koestner
My friend lent me a pair of the Psvane 12AU7 and I like them. I was hoping to get some comps to the Genelex ones to help me decide.
There is another thread discussing 6922's here that makes some pretty good points in favor of using NOS signal tubes as compared to the new production tubes . Might be worth a read .

Happy Tunes