Most serviceable and least maintenance are usually at opposite ends of the spectrum.

Most serviceable means adjustable, which means they will need adjustment eventually or frequently. Loose/caged ball bearing setups come to mind.

Least maintenance to me means cartridge bearings. Basically non-user serviceable; replace rather than adjust, and when replacing, could be that special removal/install tools are either extremely helpful or needed.

For a commuter bike, I'd go with least maintenance because I know realistically that's what it will get.