Either the Weichs or regulars.
The solos are darker sounding.
The starks could be another choice, but they're quite stiff!
I only have one Thomastik string left on my EUB, the E.
I had a solo Spiro one for a while, and yesterday I put on a Superflexible.
I have a couple of other E's to try until I decide if I put the solo spiro back on.