While I agree that Fifa WC 2010 was an incredible game, I'd have to say either Fifa 12 or Fifa 13 (haven't played 14 yet). I can't speak to PES as I played it a long time ago, and felt Fifa was the superior product.
All that being said... I miss 2k hockey. Although I miss 989s Face Off. FaceOff 98 was probably my favorite hockey title of all time. I wore the hell outta my PSX playing that. And it was perfect for head to head play. Me and my friends would play that non stop.
And I know its off topic, but the best NCAA Football game is (IMO)'Bill Walsh College Football 95. I dominated with Colorado; Slash, Rashaan Salaam, and Westbrook made up the sick offense, and Colorado had a pretty stout D too... Although they were just numbers back then. No online, but again, a hellofa head to head game. And I miss NBA Jam on my Genesis...