Should I use an EZ curl bar or a straight bar when doing my curls?
Which is best for the biceps?
Each of us is individual. Tendons, ligaments and bone leverage vary from one person to another.
Obviously if the use of a straight bar brings discomfort in the wrist or elbow then a more comfortable EZ curl bar is superior.
My own opinion is that all other things being equal the straight bar is superior for standing barbell curls than an EZ curl bar.