the one with better pilot, ground grew to maintenance, air-controll infanstructure to keep it aware of the situation and the one with better luck
If you are intressed of the matter, I suggest reading at some of the ACIC.org site's articles (there were IRC nice one of the Ethiopian/eritrean war where these two planes meet) and assorted airforce sites.
This forum is however for Shipbucket style of shipdrawings.