What factors should I consider in choosing a summer undergrad research program?

<p>I'm aiming to get into top-rated developmental biology/stem cell/regenerative medicine-related PhD program. So, I'm trying to participate in summer research programs, but I have no idea how to choose a right program for me. </p>

<p>In choosing an off-campus research program, what factors in the following should I consider?<br>
- Competitiveness and prestige of the summer program
- How influential in my field the grad program offering the summer program is
- How influential in my field the professors in the program are
If these factors don't matter in choosing a program, how should I choose?</p>