Linux fan here. I run Linux on and old 2008 iMac, a 2009 MacBook Pro, a 2012 MacBook Pro, and a 2017 MacBook Pro. EndeavourOS mostly.
Linux works amazingly on this hardware. Old Apple stuff is great gear and still looks pretty good too.
I have upgraded RAM and storage as much as possible which makes a huge difference. I actually found the 2009 unit sitting on the intake shelf at my local recycling centre. It needed a new battery but has been awesome. I keep it downstairs at home as my other computers are upstairs. I take it with me on trips where I would worry about wrecking a computer ( camping road trips for example ). I can access my Proxmox server to hit a few remote desktops and the beautiful screen and awesome keyboard make it a joy to use.
Where is macOS bette? If we are being honest, any serious macOS user will have accumulated use cases that are not as well met by Linux. Media related especially like photo and video editing. I cannot even find programs like “subler” for Linux which you would think Linux would have. Niche proprietary tools as more common on macOS. So even reading a PDF signed with a certificate can be annoying on Linux ( without Adobe Acrobat or Reader ).
If you are a developer, I would argue Linux is better.
I am a Linux user though so I am the opposite. If you give me a machine running macOS, I want to get Linux on it. For me, Linux is so much better and 10 minutes on a Mac and I will be frustrated with what it cannot do.
Even for a Mac user, Mac hardware becomes much less usable after it falls of support for thee latest macOS as so many apps will quickly become incompatible after. As I run Arch on my 2009 Mac, it has all the software I use totally up-to-date and current with the latest releases available. You just cannot compete with Linux for that.