It is tempting to go with the more affordable 2-bay option but you need to upgrade your hard drives in the future to add storage and larger drives are more expensive than lower capacity drives.

Plus, I still have another free bay in case I need to add more storage cheaply

I bought the best 1-bay Synology in a pinch to get backups back online, only to find Synology does not support full-disk encryption

I owned synology for a long while now and this is the best and fastest 2 bay one ever