Question of the week. MiG-25 vs MiG-31

This is a little experiment. Anyone who wants to may answer the question in the comments. I will try to make the questions more weekly than the posts have been so far. This weeks question, Witch is faster, The MiG-25 or the MiG-31. I have my own answer but based on proof and eloquence presentation I might change my mind. For now think of it as way to show off what you know!