Weird question.
INFERNO is easily more surreal, but PHENOMENA is more of a real movie with a lot of WTF?
moments.
I love them both but both movies have different agendas.
Anyone can fill a movie with random surrealness, with just barely enough motivation to fill in the gaps, as in INFERNO. But to weave the odd with a narrative with well delineated characters is tricky business, and ol' Dario pulls that off in PHENOMENA.