I'm a fan of the late SRAM i3 hubs. If you do the planetary math they should have 12 planets - but 9 are missing! The planets are arranged asymmetrically and the sun, planets and ring gears all have prime numbers of teeth. It has an amazingly simple inside-the-dropouts shift cable. Debuting in 2009 to replace the venerable T3, the i3 is arguably the most 'modern' three-speed design - the AW-NIG/SRF3 dates to 1984, the Nexus to - hmm - mid 90s?, the MBI to early 2000s?

Boo on SRAM department: there are no spares and no support for this hub, and only a single, miserable twist shifter was ever offered. I still don't get why they just discontinued their hubs in 2017 and dropped IGHs instead of selling the tooling and intellectual property rights to somebody.