I'm not sure that is 100% true. I know this is an unpopular opinion, but I think with all things being equal Jackson is just as good as Allen. Where the difference (for me at least) becomes apparent is when a play breaks down, Jackson panics and has a tendency to make mistakes, whereas Allen has a tendency to more often than not make a play that breaks the opponent's back.
IMHO that is a function of the coaching staff preparing the team to always "expect the unexpected". The Bills always seem to instantly recognize when a play breaks down, and everyone immediately goes into "backyard mode".
The Ravens on the other hand go into panic mode and either try to force the play, or make some ill advised move.