Interviews are (with varying degrees of efficacy) meant to gauge fundamentals - so I think you're presenting a bit of a false dichotomy.

That said I haven't really solicited advice on either. My concern is more specifically related to how to frame my past employment and medical issues for a future employer - not so much making it through a technical screening.

I was, and am, curious about what others deem important to their career and craft (e.g. fundamentals), but like I said it's mainly curiosity. If you have something to share I'm all ears, and if not I wish you well.