Congrats! You have a lot of great options! I can't say about others but will comment on CMU vs UCLA
I got an offer from CMU-Pitt CB, and interviewed at UCLA Bioinformatics (unfortunately my research interests do not overlap with the emphases of either CPCB or UCLA, and I decided to go to somewhere else)
From the stipend vs. living cost perspective, CPCB is much better because Pittsburgh is not an expensive place and the stipend offered by CPCB is great.
I feel CMU students generally spend more time on research than students in the other programs. From a work-life balance perspective it's not great, but from a research perspective it could be productive. Also anything CS-related is really great in CMU.