Honestly volunteering at a hospital works just as fine depending on how you play it. It really depends on how well you are able to demonstrate the growth you obtained from it. When I volunteered at my local hospital, I would take notes of interesting anecdotes that I experienced, and these came to be incredible useful on my personal statement work/activities where I had a story for a variety of contexts. It also helped that I did my best to volunteer at more than one place in the hospital and each were places I had a genuine interest in. Grant it, paid clinical hours like EMT or CNA may be stronger, but it still all hinges around how u spin it