RE: Biceps: dumbbells for me!
Hi, Sharon! I prefer dumbbells to barbell for biceps curls myself, because with a barbell the wrists have to stay in a fixed position that may or may not be natural throughout the ROM; PLUS my dominant side (in my case the right side) winds up doing more of the work just because it's a bit stronger and more coordinated. Plus, the weight load is more concentrated in dumbbells then on the barbell, so I too feel it more.
Annette