I would choose option 1 as well. Unless the larger stall = paddock, the size difference isn’t worth it. You’re going to be happier to see your horse more often, he’s going to be happier to get out more often (possibly 3 times per day!), and I love eurosizers for horses who can’t have all day grazing/herd turnout where they walk a lot.
If you’re able to stop by a few evenings a week, talk to other boarders about helping each other out. Instead of just taking your horse out, take out both horses (bonus if they get along and can be put out together). Then when they’re at the barn, they can do the same. Depending on the set-up and rules, you might even be able to put their horse in a sun pen while you ride in the morning, and then they can put your horse out while they ride in the afternoon.
But gosh, if being at Barn 1 means your horse may get out 3 times per day, that barn would be high on the list!
ETA: I’d love to hear which barns you really like after touring them. I’m from Shadow Hills (Sunland/La Canada/Burbank area) and may be back there within the next year. So much has changed since I left the area 10 years ago. My horse will be making a very similar turnout to no turnout transition.