How bad is it to rescind your acceptance to an REU
For context this is my first time in an REU admission cycle, I am a sophomore. I have moderate research experience already.
The situation is I accepted the first REU I got, the timeline only had 3 days to accept so I took what I got since I am aware how rare it is to get accepted. I accepted the offer; I would enjoy this opportunity, but I recently got a much better offer. Furthermore, I have been in contact with this site and I have yet to be assigned a project or a mentor.
Recently, I got accepted to in my opinion a much better REU that more aligns with my interest and is more relevant to my field of study. I have had multiple lengthy zoom calls with the mentor and the project sounds amazing and my role would be much more important than the prior REU, which a higher chance to publish and participate in conferences than the REU that I have already accepted. In addition, the pay is more both in terms of the stipend, but also in terms of the food allowance and travel allowance (the REU I have accepted would not be able to cover my full travel but this one could). Overall, I have had much better communication and overall better feeling about this REU, but the timeline was much slower.
My question is: Is it worth it to go back on my acceptance and take this opportunity, or stick with what I already committed to.