Choosing between 2 preamps

As i said got the Atmasphere MP-3 mk3.2

Congrats on the new preamp! I'd say for the difference in price go NOS not a fan of current production small signal tubes personally.

I have owned a (stock) BAT Vk30SE for over 20 years from new. I auditioned it against an Atmasphere back in the day and the BAT came out tops. It has also proven to be extremely reliable and I've heard multiple preamps since, none of which have tempted me to upgrade. I note ARC adopted the same tube after Victor highlighted its value in audio, and continue to use it. I have replaced the tubes once  (a couple of years ago), not because of a fault but just because of a presumption that newer ones might sound better. They did, but not dramatically so. The company have also been extremely responsive to email enquiries - responses are signed Victor but it's hard to believe he responds personally to each email. 
I have recently been auditioning preamps for potential upgrade, and have found it necessary to get into the >£10k U.K./>$10k price range to get a meaningful improvement. An ARC in 10-15k range didn't come close to my current VK30SE. A Zanden was similar, Kora not as good, Ayon disappointing (in another system). Octave was very good but so far the only preamp which has significantly outperformed my VK30SE, such that I feel it justifies spending the extra money on it, is another BAT, the VK90. I have paused purchase until I hear a similarly priced Allnic. It does depend what kind of sound reproduction you value or are after. I value well placed/focused imaging, with great sense of space and depth, excellent dynamics, and great detail, although always "musical" by which I mean not over-etched/over-bright or fatiguing. Which can sometimes be the price for pursuing the nth degree in fine detail retrieval.

@honeybadgertube Of NOS 12AU7s the Amperex "Bugle Boy" 7316 has gotten the highest marks in customer feedback. A good alternate is the Bugle Boy 12AU7.

In new tubes we've had good comments about the Gold Lion 12AU7.

No matter what tubes you get or where you got them, in all cases they should be vetted on a tube tester to make sure they test good, then auditioned for low noise, low microphonics and no crackling.

I’ve owned all types of Bat gear over 27 years. They’ve produced a lot of great products over that time. I’ve never been happier than with Bat gear. And their resell market is exceptionally strong. So buy it right and you’ve zero risk. Come to think about it I owned a VK31SE at one time. These products are extremely reliable. I owned VK1000 monoblocks, and also mated them with a VK40 preamplifier. It’s simply exceptional gear.