What's the most outlandish console you want?
For me, I would pick the Atari Jaguar. Such a strange and kind of bad console, but it had some pretty neat games like the first release of Rayman, Wolfenstein 3D, Tempest 2000 and Alien vs Predator. Not to mention it's filled with charm. Beyond that, maybe the Atari Lynx, for similar reasons.
If I had to choose just one, I'd probably say the Bandai Apple Pippin @Mark White Console . It may be a bad console, but it was still a unique experiment and had features that were firsts for a console, like internet support and (From what I've gathered) cross compatibility with Mac (I'm also a fan of vintage apple stuff), so I think it'd be cool to own.
Now, if I had to choose a system that I actually have a decent shot of getting, I'd say the MB Microvision Console [EU] , mainly because it was the first portable game system (with cartridges), and just has such a unique cartridge design with the CPU being in the cartridges and whatnot. It also looks nice on a shelf and from what I've heard, quite a few of the games are fun.
Very cool! Microvision and the Vectrex are both great underrated consoles from what I've heard. The Bandai Pippin's an interesting choice just because it didn't have many games released for it, but it had the first Journeyman Project game, which was a decently popular PC series back then, and I think the Pippin release was the only console port until the 2010s.
If it wasn't so darn expensive, it'd make a great conversation piece in anyone's collection, and if your correct about the backwards compatibility with Mac games, a fun and unique way to play PC games from the 90s.