As an undergraduate, I have a choice between working under two different professors in the Physics department at the university that I am enrolled in. One is theoretical, so my work would be in helping derive equations, and the other has a lab (not a super high-tech one, but a lab nonetheless). I have essentially started working under the theoretician, mostly because he has taken a much more active role in recruiting me and he is a bit more organized, and also I am slightly more interested in the research. However, I have a question. Essentially, if I wanted to do grad school research, how will choosing not to work in a lab affect my chances of getting into a good program? Will it confine me to the theoretical field, or is it easy enough to make the transition once there? Do grad schools evaluate those with theoretical vs traditional lab backgrounds differently? Many thanks for reading!