our eyes generally will follow lines not knowingly, in #1, the attraction is the black curvy lines, then your eyes follows as they all concerntrate towards the stirer. then your eyes will follow the stirer toward the borders and then out of the photo. after that, there is no lines connecting to the top half (side also can) borders to lead the eyes back into the photo.
next you do notice to top side is brighter, eyes always attracted to bright patch. the brim of the cup @ bottom is consider heavy, together with a/m, viewer attention will naturely be leaded up & out. when that happen, they go to the next photo.
#2, the brim will bring the eyes in circle, in & out of the photo. given the fact that this photo is bottom is bottom heavy (ie 3 subject where the eye can rest @, the charactor, the cocoa powder & the brim of the cup), your eyes will not stray to the top side. the brim @ the bottom is very heavy, but it is balance by the lighter shadows.
i am no pro and a/m is only my opinion. pls share with us if any fellow cser has view that may be otherwise, than we can learn more about photo appreciation.
btw, have you ask yourself when you say you like #2, why is it so? what is it about #1 that you dont like?