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Play each one for 30 minutes and then stick with the one you like the most.
I like this idea.
Buuuut....You'll probably run through Tomb Raider the quickest and Skyrim, if you're enjoying it will take the most time. I can't say anything about Dead Space 3, I've had it for months and can't bring myself to play it.
I will not be pushed, filed, stamped, indexed, briefed, debriefed, or numbered! My life is my own.