I think it depends a lot on what's already in place. Are you a Microsoft shop? ASP Core is your obvious choice. Already doing Django? Keep doing Django.
If the question is what stack you would choose for a personal project, I think the answer is "Whatever you think looks interesting."
Agreed. My default would be C# with ASP.Net Core (though there are also other options), but that’s because it’s my favorite and the clients I work with are primarily MS shops. Yeah the front end may be Vue or Angular or React, but all of the backend code and competence is in C#. Since it’s also where my area of expertise primarily is it’s an easy choice.
Unlike OP here, I would make the same choice for my personal projects, but that’s because I’m well into my career and life. I have plenty of personal projects, but they’re all about doing something, not about learning a completely new tech stack just for the sake of it. If it takes me 100 hours instead of 10 or 20 because I’m also learning a new stack, for better or worse, it’s not worth doing to me.
If the question is what stack you would choose for a personal project, I think the answer is "Whatever you think looks interesting."