I grew up using Mac computers, and for a long time, I've wanted something that would allow me to use all those old applications and games in a more convenient setup. I now have the perfect 'retro' Mac, at least for me: an upgraded Mid-2010 Mac Mini.
This compact low-power
I’d be tempted to say that the 2014 Mini is a better bet for retro Mac usage.
It’ll still run Sonoma via OCLP, but has the benefit of USB 3. Bung a huge SSD in there and you can use it as a media server too. I have a 2014 that’s about to become surplus to requirements, so that’s precisely what I intend to do.