Grand challenge vs Explore LLC Computer Science Major

I am a computer science major who was recently admitted to both the Grand Challenges and Explore LLC. I am having a hard time deciding between the two. I want to conduct undergraduate research, which would fit the Explore theme better, but I read that Explore is mainly CoS research and I want to do computer science related research. Grand Challenges seems cool, but I feel like it might take too much of a time commitment, especially since I plan to join a lot of computer science clubs. Any advice would be greatly appreciated!