The paradox of choosing a distribution

Hey, folks. I'm a computer enthusiast and programmer. I've been mainly using Windows as my OS for like 10 years but I have some experience with Linux. I started taking Linux seriously recently, I am considering using it as my main OS. I've used Ubuntu, Mint and Debian. I also have Arch installed but the long installation process was very boring and kinda discouraged me.

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Now the question, what distribution should I use? I want to really dive deep into Linux and understand how it works. I want to become a computer professional, hence things like operating systems should be grasped well for me to be so.