Can only watch one of them on the big screen. I am a Trek fan so I am heavily leaning toward that film, but the Iron Man movies have been pretty darn good too.
I may be able to sneak in without the family and see them both, but with theater prices these days a trip for all of us with popcorn, soda, etc, usually sets us back nearly 100 bucks. I can go alone for under 15 most of the time, yet the womenfolk cannot go to a movie without it costing me nearly 25 bucks a head on average.