Yes, all three are strong choices, and they're meaningfully different from each other. Scribing shows you exactly how physicians think through a case and document it in real time. EMT and CNA roles put your hands directly on patients and teach you to provide care for people at some of their most difficult moments.
If you want to understand medical decision-making from the inside, scribing is the stronger fit. If you want direct, hands-on patient care experience, EMT or CNA work is the better choice. Either option is far more valuable to an application than no paid clinical role at all.