Mint should be fine, you might try the debian 12 based version they offer
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I was hoping to stick with Mint. Maybe the non Cinnamon ones would run better I was thinking.
His advice for a Debian 12-based version is still Linux Mint.
There's a version of Mint called Linux Mint Debian Edition (LMDE).
Mint is normally based on Ubuntu, and Ubuntu is based on Debian. Linux Mint Debian Edition is based directly on Debian, skipping Ubuntu. I think it's running Cinnamon.
I have no advice, I'm running Linux Mint 21.2 Cinnamon Ed., but I'm on a 2019 Dell PC so I can't guess at your results. Only been on LInux since June myself.
Ah thanks. So I should research whether LMDE is less resource intensive than the other versions of Mint. Or just go for it.
I have installed LMDE in a 2013 iMac. This distro rocks. I am expecting it to run just as smoothly on your iMac, even if a bit older. Whatever you decide to do, install an SSD on it and then… enjoy!