trembert

Hey guys! So I've never used GradCafe, made an account 5 minutes ago, but have heard good things about it and thought this would be the best place for quick, knowledgeable answers. So to cut to the chase, I was offered the NSFGRF, DoE SCGF, and NDSEG fellowships. To be honest, I'm not as knowledgeable as I should be about these, mainly because I didn't really expect to receive any of them. Some of the professors I talked to are also not super knowledgeable, so I originally accepted the NSFGRF with a one year reserve year with plans of accepting the DoE as well, such that I wouldn't receive funds concurrently but would still be able to accept both fellowships. I have found out this is not possible, and I basically need to pick one. I know it's past the NSFGRF deadline, but I've been told I'd be able to withdraw if need be. Long story short, which should I pick? And why? Any and every bit of information or advice would be amazing! Thanks in advance for any responses I get. My deadline to decide is this Monday, May 7!