If only you could see all the reputations of all the nodes in a thread, then you could compare.
Although it isn't a complete solution, you can choose to order the notes in "Best First" order in your user settings. That will allow you to tell whether one note's rep is equal to or greater than another one but it won't give you any idea by how much. It will also only help you to compare the immediate children of a particular parent note; it won't help with notes in separate subthreads.
"My two cents aren't worth a dime.";