Ok, so, for the 2008-2010 machines, depending on the memory available, you can try Linux Mint, EndeavorOS, or, maaaaaybe (on the ones with dGPUs and more memory), Pop!_OS.
For everything post-2010, Pop!_OS. Maybe Endeavor OS of you happen to like it, but I think Pop!_OS has really done a lot of work to become the new, de facto “where to start with Linux” distro after Ubuntu got enshittified (Linux Mint for older machines)— especially because popOS has a custom-spun NVidia version that is one of the few out-of-the-box distros that “just works” with NVidia cards.
Edit: after some tinkering, you may pick LM over Endeavor for the older ones, or just Endeavor for all. I’ve never used it, so I don’t know how well it will do on older hardware, but LM is great for that.
popOS, on the other hand, is great for hardware that can run it (and a lot can), so check that out. It’s my favorite, and a daily driver in my server and another machine I have, both older Macs.