Coreelec or Armbian?

What is the advantaged of coreelec over straight Armbian ubuntu ?
I have A H96 max 4/128 Running Home Assistant
So what would I gain from coreelect on another box ? The one to act as media player. X96 Air. S905x3

I don’t know much about Armbian, but it seems it is intended for different things to CoreElec.

CoreElec is “just enough OS for Kodi”, so it’s basically a media player and very little else. This allow CoreElec to run Kodi just about as well as the hardware allows.

Armbian looks more like a lightweight but well featured OS, so is likely to do a bit more than just Kodi, but with a slight performance penalty associated with doing more than one thing.