I'm playing less than I would like so I'm only on 4/20.
Edit: What is better to choose during hold up if you already have the persona? Money, items, or all out?
4/20 huh... not a bad day to stop on...
After experimenting with all 3, I find that items is usually the best. Since you get exp, and money, along with the item they give you. Most of the times the items are pretty crappy though. If they see that they already have a persona of the same type in your party, they are also more willing to help you. I think it gives you the same amount of EXP you would get for killing with an AOA too, not entirely sure but that's what happened with the horse enemies. I think you might get end of battle items as well.
I also found that money is by far the worst choice. Usually the money given isn't a lot, and I don't think you get any end of round exp (or a minuscule amount), and definitely no extra end of round money or items. So the other choices give you money as well, this choice just sacrifices anything else for a little bit more money, which fighting another battle would give.
AOAs are in between, and also the fastest way to end a battle. Unless they give more EXP than asking for items, which I'm still not sure about.
Also does anyone know when exactly a persona is registered? Like if I hold up and convince a persona to join while having a full party can I just immediately delete them and still have them registered for later use? Do I have to bring them to the velvet room to be registered for the first time or is that only for later updates to already registered personas.
Yeah like the previous posts mentioned, you don't need to manually do it. But I think Draekon mentioned there was a PS4 glitch or something where if you delete it outright, it wouldn't register or something, so just make room for it just in case.