Obviously Rolling in the Deep. It has more broad appeal (so is more generally liked, and straight males even like the song), and is a more unique song. Poker Face and We Found Love are just the same as most of the pop hits during 2006-2012. It's the unique and different songs which will be most remembered.
I can see Rolling in the Deep finishing in the top 10 songs of this decade tbh.
Rolling In The Deep & We Found Love. Adele will be like Celine/Whitney/Mariah in having that big emotional song everyone remembers, knows or will come to. I see "We Found Love" being turned used in several things down the line, can't put my finger on it thought.
I always forget "Poker Face" until its randomly brought up here.
But it's still Poker Face.