Driver board comparison?

We have Hi gain, low gain, and now octal tube driver boards for the ST-70 and 120 amps. Has any one compared theses boards as far as overall sound differences to each other? I have both the hi gain and low gain boards for my st-120 and they are both optioned with the upgraded caps.. I don't know if one is better than the other sonically, but I know I've amassed a large quantity of tubes!
The reason I ask is because I'm thinking of building a ST-70 amp, and was wondering if I should use the hi-gain board I have laying around, with plenty of nice vintage 12at7 tubes to populate it, stick with the low gain board and steal my good tubes from my ST-120, or go with the octal board and start buying a whole new set of tubes?
My main goal is to build a new amp for a smaller listening room, with the best sound I can squeeze out of it. I have no complaints with my ST-120, but it will be such overkill, and I really have the itch to build a new project anyway.
Any and all input is appreciated! Thanks, Kevin

You got that bug. That itch to keep building. It’s addictive, fun, and a little dangerous.

I know it well.

I don’t know about the high gain board but I don’t think you can go wrong with any of those choices.

I don't know anything about the AT7 board but with the AU7 board, you have a ton of choices in tubes. Lotsa versions of 12AU7's out there.

Worth mentioning, the newer boards have several improvements, most notable of which IMHO would be the CCS tail on the drivers. This keeps the current at a set level that's not affected by line fluctuations and demand. Result is better stability and improved sonics.

PS - speaking of tons of choices ... still happy with the 6SN7 center driver here. Haven't swapped that for maybe a year, which is easily a record here.