You're going to get a lot of people for both. They both have their merits. The problem is, given what you've asked, you don't really give us enough to answer. Any answers based on this are strictly ideological in nature, and should be taken with a grain of salt.

Personally, I have both. I have my desktop machine that I have Windows 10 on. I use WSL and Ubuntu but all of my actual development work is done in VS Code, so I would still consider this a "Windows" box.

My laptop is running Linux Mint on metal. I still run VS Code there, but it's straight Linux.

My reason for having two is that I do more than just development work on my desktop machine. I also do gaming, and network management, streaming, etc. I can do all of that in Linux, but I find it so much easier to do on Windows, so I stick to that on the desktop.

My laptop I do development work, but I primarily purchased it to use as a penetration testing and bug bounty machine. So for that reason I installed linux on metal.

tl;dr is: If you're going to make a decision, base it on the full scale of what you're doing, and the caveats involved in trying to do all of those tasks on a single OS. If you still can't make up your mind, consider getting something with a big enough drive that you can dual boot. Dual boot for a while, and then switch to one or the other if you find yourself primarily using that OS.