I chose Total Recall because, at least to me, it has Arnold in his most hilarious in a decent story with nice world building. Only Conan comes close in the world building department for me in terms of his movies. Sure, T2 had the amazing futuristic sci fi angle, but we weren't really in it, so to speak. Total Recall, as dated as it is, really has you 'in there', especially when he gets to Maaahhrs. I love Predator but I don't think I can watch it as repeatedly as TR. Commando is full of good action and hilarious one liners thanks to Steven DeSouza's script...and I was very close to picking that as my movie, but I find "Jeehh-nnyy" slows the movie down at times.
The Running Man's all good for me....until the ending AFTER he kills the game show host (which was awesome). That kiss felt forced and killed it for me.
Oh, and another reason for Total Recall? Sharon Stone: