Afaik there is only one docker; at least accessible with unraid apps.
I have a very small server. I'm the only one user of my server. It runs on a HP Z620 2xE5 2650V2 with 128GB Ram. All the files are on a 2x1TB nvme btrfs pool.
Right after the installation i think it took a a day or 2 to generate preview for my 80k photos. But i mainly use it for files, calandar and contacts.
The main advantage of aio is, at least for me, the ease of installation (fulltextsearch, collabora out of the box is a must have) and integrated backups.
The AIO data size is 40GB (photos are mounted with external files so not on the pool.