I think that in general, having research experience will help you get into graduate school. So, participating in any REU will increase your chances of being accepted. Even so, just because you participated in an REU at a particular college, it doesn't say anything about whether or not that college will accept you for graduate school. Being picked for an REU means that they were somewhat interested in your work, you were at the top of the list of people who applied, & you shared a similar research goal or interest with the person who picked you to work with them. Graduate admissions is a completely different process with different people in charge of accepting/rejecting applicants.
On that note, I know tons of people who completed REUs at top colleges, but when they went around to apply for graduate school, they did not get accepted. Conversely, I got rejected from an REU program at Lehigh University, but they emailed me and said it was just because they couldn't find a mentor whose interests matched mine. They still liked my work, and they encouraged me to apply for graduate school and even waived the admissions fee.