psychological feeling ? hehe.. cuz when u think u cant lift anymore u can just hook it back ?

or maybe the bar of the smith machine is lighter than normal free benching barbell..

or also maybe u don't need to use your smaller muscles to balance the free barbell with weights..

i personally like the free barbell as i go up on a small arch when im pushing upwards.. and plus the balancing part is good for smaller muscles groups think i..