They both have big problems, neither is better in my mind.
Polish
Pro
-Much more dramtic background, speaks of war
-Background full of red, for passion = phoenix
-Dynamic pose of Wolverine
-Jean's wild hair
Con
-Rogue's alignment in poster, shouldnt be there
-Lack of proper hue change for beast
-Angel's alignment with picture plane
U.S.
Pro
-Angel's stance, and driven for sexual appeal
-Beast no longer as tall as angel in poster
Con
-Background is designed for Storm, she's not in front, background fails
-Background doesn't justify reason for Storm's wild hair
-Jean is completely outta place
-Rogue again
-Lack of dramatic/dynamic
-Poor resolution of Kitty
Overall poster problem is the question it asks.
"Whose side will you be on?"
should be
"Who will you stand with?" <---within context of picture
And the basic problem
Shows no division between sides.
You are basically asked to choose a side with only the X-Men featured
-They should have had the poster with Half X-men Half Brotherhood.
As an art major myself, i find it disturbing how blatant faults are present in both posters.