Well, just about anything can get you a place to park and repair, albeit with differing levels of complexity involved. Reprocessing is unique to citadels and NPC stations. Selling loot, just go to a market hub for that nothing else is worth it.
I guess it’s down to how much logistical overhead you can bear, and how much you care about reprocessing VS not being evicted, and how complicated you can stand to make the setup. An Astrahus is very easy and simple, but people will try to evict it just cuz they can do it easily. It’s cheap but imo not worth it if you just want a reprocessing place and home.
If you really want somewhere you can say is your own, but also don’t want anyone evicting you, go for a dickstar (preferably large, but small or medium work too, just less effective at eviction deterrence). The downside is its complicated, more expensive to upkeep (looking at about 800M/month for large, 400M/month for medium, and 200M/month for small), has a short eviction notice (1 day 17 hours from initial bash to pos go boom, if you fill it up with stront), and cant do reprocessing with it. Parking and repair is doable but more complicated than a station or citadel. You can throw a Nestor into the pos and refit off it, and use local repair modules for free (but not instant) repair off your capacitor. You can use industrials for holding things (DST fleet hangars are a godsend), and overall you can still fully live out of a pos even if it’s tricky.
So again it’s really a matter of it depends. Weigh the benefits, risks, and costs of all the options and do whatever you prefer. You can always also try the other method if you try 1 and it doesnt work out as well as you hoped