You can run Linux on any Intel Mac with having not more compatibility issues than you may have with another (PC-) Laptop.
I have on old MacPro 3.1 under my desk, just for fun and I love the design. That means hardware design, too. It runs any Linux and Windows very well.
Apple designs pretty beautiful hardware that normall lasts long, as well as using much better (resolution wise) displays as most PC hardware. There are reasons why prices for used Apple Hardware are that high, it is not just a hype.
If you buy older PC Hardware, you should stay with the professional lines, these are build with durability in mind.
I have an Thinkpad Z60m here, that runs XP with old measurement hardware still perfect and looking as new. It's heavy like a brick according todays standards, too.