The watch

Interstellar is my husband's all time favourite movie. I've lost count of the number of times he has watched it. I want to gift him THE watch for his upcoming birthday but don't know which watch to get. Can someone help me? Should I get the Murph or Coop? I like the Murph but maybe it's because I'm a women and I'm projecting, but I also think the leather strap makes it look more modern/youthful. I also don't know what size to get. Or do I get the cooper? Fellow Interaller lovers who know anything about watches, please help and thank you very much.