Bottom is a mortal who is a control freak and basically intolerable. His name says it all, and later in the play when his head is turned into that of an "ass" it culminates his attitude and personality.
Puck is a Pixie--not a mortal. He is not intolerable, he just enjoys playing pranks. He serves Oberon the King of the Pixies with loyalty and zealous joy.
Bottom Is So Controlling and Bossy He Wants To Control Everything and be incharge all the time
On the other hand Punk is so Joyful. People Love Being Around Him And It Seems That He Is A Carefree Pixie That Loves To Play Pranks!