re: Arnold vs Stallone. Which has the better filmography/catalog.

Arnold has a higher number of top tier movies than Sly but Stallone has a more varied filmography which makes it easier to put something on for any mood. A few comedies aside, many of which were action oriented, Arnold wasn't ever given too many chances to stretch himself as an actor beyond being an action star while Stallone has more dramatic stuff like Cop Land, Rocky, Rocky Balboa, and Tulsa King on his resume.

That said, I think given the right script Arnold could actually be decent in a more dramatic role as he has some nice moments in movies like Twins, Kindergarten Cop, and Maggie.