I only geek completely for XII. (In fact I just beat Ahriman for the nth time. Damn that boss is tedious. Quickenings, aaaaahh.)
I went for Lex. Every time an FF is mentioned he's like 'oh I first played that back when I was [insert age], I really hate that [insert boss of some kind] Tres and Demps etc might be more passionate about story and characters (not that Lex isn't) but he's also big on the game play and he plays a lot of games. Also I believe he's the only one on the list to be into XIV: A Realm Reborn (although I think Tets played it too?)