Just picked up two 2013 Mac Pro (Trashcan) any thoughts on what to do with them?

Picked up a 12 core and an 8 core with 64gb ram, both with d700 GPUs for a steal (150 each). Was thinking of running the 12 core as a server and maybe another as a dedicated router running pfsense and connecting a thunderbolt raid array for local media and jellyfin? Havent done any home server/homelab stuff before so was wondering if there were any Mac server things worth running or if I should just format them to run Ubuntu or something.