Should I write LOCIs or be grateful for my options and keep it moving?

Basically the title. I was admitted to Columbia and Duke and waitlisted from Williams, UPenn, JHU and Pomona for CS and polisci. Are any of the schools better for my majors, that i should choose them over Columbia or Duke? i'm kinda tired to write individual letters for each school, but i'm scared i'll regret it and think what if