Arnold for Conan... I like very much the character and read almost all conan's comic books by the time I saw the movie.
and stallone...hhmm, hard to choose, I haven't seen twice any of his movies, of course when I choose to see them because when Rocky is aired, everyone is watching it

i would say Arnold for Terminator 2, but stallone is a better actor; just look at Copland, he did great really

Cliffhanger was a great action flick too

Schwarzenegger hands down
edit: wait they are both bad :P