...and independently maintained by one developer for the entire world...

This makes me uneasy. Hats off to them and best of luck to their endeavours, but I would still rather choose Void simply due to the fact that there's a team behind the project as opposed to one individual. Something happens to them and then what?

From their wiki:

What Makes Vostok Different? Void Linux is powerful — but it requires effort to set up. Vostok removes that barrier entirely:

• KDE Plasma out of the box — a full, polished desktop environment ready from the first boot
• Everything pre-configured — codecs, drivers, browser, fonts — all included
• Vostok Repository — hundreds of additional packages not available in the official Void repos (Brave, Figma, and more)
• Beginner-friendly, expert-approved — simple enough for newcomers, powerful enough for professionals
• 100% free — no subscriptions, no telemetry, no corporate strings
• One developer, one vision — transparent, independent, and built with love for the community
• Open to everyone — developers, designers, gamers, students, sysadmins — Vostok is for all of them

The em dashes definitely gives me LLM-vibes. Regardless, it mostly comes over as Void Linux with KDE Plasma and some onboarding. And I suppose they have their own repository. Furthermore, I think it's a very new distro as their Github activities only go two months back.

To OP: Why would you use this over (some) other Void derivatives? Secondly, as you state

I can customize it myself

Why even bother with any of these to begin with?

• Eh, I don't see the point. It seems Void already has a TUI installer you can use, then afterwards you just gotta Install your DE of choice.
• Void is a smaller distro, and as such you might not find as much help for it online compared to other distros, so I think think it'd be best for you to use it directly and do things the "manual" way first so you can gain familiarity with its inner-workings, so you can better serve yourself/fix issues you encounter.
  Jumping directly into a "niche of a niche" distro that does everything for you doesn't sound like a good idea if you don't already have familiarity with the base system, IMO.

I would just use void, but I love the logo

If you want "as barebones as possible" then wouldn't you better off with stock Void? It's nice and barebones straight out of the box.

This is not just a Linux distro. It's a satellite drifting through the universe of code and possibility - for you, for everyone, forever free...
Built with ❤️ by one developer, for the entire world.
Source: https://vostoklinux.org/about

I believe that the developer must be: https://github.com/davidivashevich

I've been using Void Linux the last 2 years and I didn't knew that it had derived distros. Amazing!

It looks interesting, Void is very solid but it miss some package and I'm not a fan of flatpaks, also the focus on KDE is nice.