Either your monitor or your video player will be down-rez’ing the 1080p version to fit your screen if you use the 1080p version. Why not let the pros do the down-rez and use their 720p version instead? – and save bandwidth in the bargain. So, I agree with you @Sarah90.

Now if you are all keeping your downloads for possible later viewing, then get the 1080p version because someday you’ll get a higher rez screen. That would be a worthwhile reason to get the big one.