Through 12 & 24 it's about 20 mi more and higher elevation gain but it's MUCH more scenic. You could maybe plan a stop at an RV park in Torrey or Hanksville?
Doesn't really work with our abbreviated itinerary. Any time I spend there would eat into time I'd have been spending at Arches.
Have you ever been to Monument Valley and Page area? If not I would consider Blanding-Page-Flagstaff instead as, again, It's more scenic.
As you will not have much time to wander around, you should try to maximise the most interesting roads.
Totally agree. I have not been to either.
Are you saying they're more interesting that Petrified Forest and Canyon de Chelly?
After Arches/Canyonlands (and @Owner - thanks for your two cents there), I'm pretty much on a beeline back to San Jose but willing to do small/short sidetrips.