What’s the best Vodka?

My co-worker helped me get a great deal on some home improvement work for my place. As a gesture of appreciation, I’d like to gift him a really nice bottle of vodka. It’s his drink of choice.

I only socially drink beer & tequila… what do you recommend? I want this to be a classy but not an obvious pompous recommend. I don’t mind spending money, he saved me thousands. Prefer to be great by tradition.

Thanks in advance! Looking forward to learning something new.

Edit: he’s an older gentleman. Maybe in his late 50s, early 60s. We’re in the USA, but I have time. I’d love to get him something E European! That would definitely be a more unique gift in the US.