In the end, the one ring you will use most of the time would be the movement speed ring. The true one ring that every job will use.
Seconding this. If you play any jobs without an 18% option and multibox, it's invaluable just for keeping your follows straight. It also color matches d.ring and gets you a huge chunk of additional useful stats in your idle for jobs that do have an 18% option(feet or legs as a slot are worth much more than ring as a slot). All of my non-crafters have shneddick.
Orvail if you have or plan to make an escutcheon.
Weatherspoon if you're hxcore rng.
Vocane has some value for certain jobs, if you have a spread that favors it over shneddick or shamelessly speedhack everywhere.
Rest are garbage.