Instinctively I'd say play 2 first, if you're really commited to playing them all. Pre-sequel has a bunch of small things (I'd definitely call them improvements), that make it a little harder to go back to 2 afterwards: the butt-stomp, low gravity that goes hand in hand with more verticality in the levels, a better waypoint system, the best (one might say the only good) vehicle in the series, non-mute main characters.
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