big face= E-flex is better
Smaller= i4's
personally for me I like the foam more on the e-flex, its more supportive, but the ears arent as comfy on the E-flex as they are on the i4's my face is a bit wider to the e-flex is better for me, I also have profits and the ears are the best but breathing is an issue...but the good side to that is you don't taste paint
good luck, you should go to a shop that has them all and put them on before buying.