That's the question I put forth. I suggest the criteria to be:
1) Both have to be human beings. (that eliminates Wray and Kong)
2) Appeared in more than one film together. (Yes, Gable/Colbert Qualify)
3) Box office success/awards. (choreography and technical awards excluded)
4) Social impact. (pretty much excludes Cruise and Kidman)
I have a definite choice in mind but I'd like to hear yours and of course, your reasons.