Piefed has some neat features unique to it, such as:

• a very nice gallery view for image heavy communities.
• the ability to combine comments from multiple communities under one post, if the same link was posted to all of them. You can see an example of that here (notice how the comments have dividers for each community).
• the ability to create and subscribe to a pre-made list of communities, sorta like a multi-reddit.

On the sysadmin side of things, it'd bring some nice advantages regarding network resource usage and page loading speed, and benefits from using tried and tested industry standard frameworks (I.e, Flask), instead of bespoke solutions.