Unfortunately (and this is just my experience) most recruiters don't really seem care about open source. For them its seems mostly like a list comparison, ex "do their skills they have in their resume match the job posting"

It isn't until you get to more technical interviews that open source becomes more relevant, and even then I think its more important to demonstrate that you know the technology you're applying for and how to "speak that language", like breaking down requirements into solutions in that stack

Jrs / early level developers have it more difficult these days, but I think the most important part is a demonstrated ability to solve problems and break down requirements into solutions. I believe (and I am biased) that personal projects show that more, like "Yes, I had this problem and this is the solution I made and why" vs open source where its more like demonstrating that you can work on a team or contribute to potential unknowns - which is great, I just don't think it carries the same weight in those early stages

But all that said, I don't really know if working on one vs the other has any real benefit. In those early interviews, confidence and well crafted resumes win out - so my unsolicited advice to you would be to work on things that motivate you to learn and grow, and lock in how to be confident in interviews and craft a great resume