No direct experience with either, but looked at both and decided on a Blue ODROID N2+ (4GB ram, 64GB EMCC) preconfigured with HA from Ameridroid: 1) didn't need Matter or Zigbee, 2) didn't want to mess with finding a Pi and building it all; 3) concerns about Pi speed and memory.
Thanks for your input. Your points 1,2 & 3 are same as my opinions.
I want to use HA as an integration tool for my other devices:
I already have Homematic for comfort control; Samsung Smartthings Hub v3 for lighting and power.
Have decided on the Green as it is basically a Single Board Computer preloaded with Home Assistant.
First steps will be to integrate my existing set-up and weather station.