dunno they are both good.
i had lost my "fear/respect" of Bowser allready, befor playing PM1
and since that i never really felt the world was in any danger.
but that doesn't stop the awesome of the game.
ONE silly thing i really like better with PM1 is the sewers, it's nicer to see actual sewers under the entire contry far & wide, and i hope they will make a future mario game with more & deeper sewers, to explore.
but i kinda liked PM2 better in some sence in the end.
i Liked the story & characters, and the X-nauts where cool.
but i didn't like the shadow queen, she was way to predicteble ¬¬
you KNOW she was gonna betray the Grodos, you Know she was gonna ask mario to join her, and ....well way to predicteble.
(thank god for unpredicteble-awesome Dimentio of Super Paper Mario)but PM1 WINS with the end credits