The other comments do a good job explaining why you would go with X or Y distro based on your requirements. What I want to do is give you a general recommendation/piece of advice based on a feeling I get from reading your post that, that you are not excluding the possibility of tinkering with your system at some point in the future to get it less bloated and more streamlined to your use case (please absolutely correct me if I’m wrong about my interpretation).

As such, I think if your current computer has the ability to reasonably run Mint you should go with that. The reason is that it simply works most of the time without much hassle. As someone new to Linux, that’s a big part of the transition. A lot of stuff is new, so there’s no need to force extra complexity on top. You have the ability to dabble in said complexity even with Mint, but its not required, and while I am dying to recommend Arch to you having read that your PC is a bit on the less powerful side (the meme is real guys), I don’t think its a productive use of your time nor a healthy level of stress to deal with at this point of your “Linux progression”. That’s why I recommend Mint; make the transition, have the ability to slowly and eventually play with your system to an increasing degree as you get more comfortable with everything, but don’t handicap yourself from the get-go. Eventually, if you do decide to go with a distro which gives you more control in exchange for higher experience/knowledge/tinkering then you should have a solid foundation of skills to build on.

tl;dr: I recommend Mint so you get used to Linux, looking up solutions online, using the tools (commands) available to you to diagnose problems you may encounter, and if you decide its good enough for your use case - stick with it. If you want more control, think of it as a learning experience which will allow you to at some point delve into the more hands-on, complex distributions.