Book recommendation

It's a friend of mine's birthday soon. ("So what?!" I hear you ask.) She's newly bitten by the running bug and would like a book on running as a gift. Thing is, what's the real difference between RW's "Complete Book of Running" and RW's "Complete Book of Women's Running"? I'd like to buy her one or the other but have no idea which would be the best for her. Advice appreciated!