I like MIG31 but in the MIG family I am more into MIG-29 and MIG-21 MIG-31 is fast but outter body just not as good looking as MIG-21 and may not have the turning radius of MIG-21
I love 29's as an air superiority fighters, but I also enjoy 31's as a heavy interceptors. Two different jets. Not comparable for me. 
I still say MIG family planes are better they kill alot of F-4 during Vietnam with MIG17 19 and 21 planes But as a History major I do not support any side in any war front I Respect both Aircraft designs of both US and Soviet Union
I am more for the shape and look of the plane rather than what it can do if it looks cool I like it I like Soviet jets as much as NATO made jets