Give Kevin Deal of Upscale Audio a call. I've bought quite a few tubes from him and have always been quite happy. Here's his 12au7 page:
Of the 2 brands you mention I would go with the Genelex Gold Lion 12AU7 reissue tubes. Just on the support alone and the vast availability from reliable vendors. I'd get them from Jim McShane. He does very in depth testing of the tubes he sells and is well versed in the reissue tubes. I use the Genelex Gold Lion 12AX7s from Upscale Audio and they are awesome in my Jolida amp.
Not sure if this applies but it's an excuse to talk about tubes so here ya' go: After
trying various 12AX7s I'm now using the current Russian (there are now
"authorized" Chinese versions available and they are cheaper but I
have no idea if they're as good) Gold Lions I bought with "matched
sections" from thetubestore.com. They're great in my Jolida 502p seeming
to sound somewhat better than the Psvanes and others (I had a Psvane 12AX7t-II
wear out too quickly). I recently bought a set of "Platinum Grade" from Upscale
UK Mullard NOS 12AT7 "gold pin 6201s" as I love the 4024s but
wanted an extra set of Mullards in case they become more rare...not sure if the
6201s sound better but still...gold pins...I like gold pins...I want gold pin
KT150s...is that so wrong?