NIH summer internship in biomedical research?

I know i asked a similar question earlier, but I was wondering what was better for me to do. I am a sopre in college working on a degree in biochemistry with a premed track. This summer i will be going to guatemala on a medical internship working in a clinic. Would it be better to do an NIH internship? or shadow a doctor. I am asking because ill be doing clinical work in guatemala for a month regardless. what would look better to med schools?