hmmm...good question i think it depends...like if your going against a strong dline (ravens, cards, fins or pretty much any 3-4 team) you want strenght...but when you are facing a team with a more finesse line (giants, eagles, panthers..4-3 dlines are more finesse) then you prolly want footwork...
but I would take strenght over footwork cause then if you line gets a good block then the defender is pancaked
you kinda want both to be balanced...i know cardinals (i assume u like them cause of ur pic) overall the oline is bad..