I highly recommend EndeavourOS for old MacBooks.

I have a 2008 iMac, 2015 iMac, 2012 MacBook Pro, 2016 MacBook Pro, 2013 MacBook Air, 2017 MacBook Air, and 2020 MacBook Air all running EOS (last one uses a special kernel because of the T2 chip).

They all run flawlessly including the Broadcom WiFi. The Arch kernel is the only one I have found where these drivers work well and EOS sets them up automatically during install.

CachyOS is also an option but the video is wonky on my older MacBooks. EOS is flawless.

I have 4 Apple laptops running Linux, so I have some experience with it all.

The Macbook Air 2011 has wifi driver bugs, on large downloads/updates you will experience crashes (complete lockups). This happens with either of the two drivers available for it (foss linux and broadcomm). I suggest you get a tiny usb wifi for it for $6. You blacklist the internal driver first.

For the 2008 macbook, consider if it has 4 gb of ram or not. If yes, use linux, if not, have it as a toy. Maybe install something Q4OS (with trinity DE), or even Haiku. I personally don't use Linux on less than 4 GB of RAM. Yes, it loads fine on lite distros, but the moment you want to do some web browsing, you'll hit the swap, which destroys the drive. 4 GB RAM is my minimum. Also, the fact that it doesn't have EFI, it will work best with Q4OS (which is Debian based), and Haiku.

For the 2013 one, I'd suggest Linux Mint, it works great. You might, or might not require a usb wifi too. On some newer macbooks the wifi works without crashes during usage, but it doesn't let the machine wake up properly you see. So all that stuff need to be tested by you.

On the 2015+ macbooks, the webcam doesn't work usually (the third party driver doesn't work properly either).

fyi the 2008 macbook probably throttles the processor to around 1ghz when used without battery. on windows i could work around it by using some program to disable BD_PROCHOT(?), but failed to do so on linux.