One supplier is as good as another as long as you get what you want. I've had very good luck with both Andy and Upscale Audio. I've read posts criticizing both guys for one thing or another which is normal for high visibility people dealing with NOS tubes and hot rod audio gear.
If your tubes are quiet, have good transconductance and sound good, you're well off regardless of supplier. In fact, I've bought at least 50 tubes off EBAY over the past couple of years and got good product. In some cases when I ordered from Germany and Hong Kong I got better than what I expected.