Halo wins 9-5.
Final Fantasy VI (7)
VS.
Metal Gear Solid 2 (2)
This is rough. FFVI is popular, but is not as popular as it is some other places largely thanks to age. Metal Gear Solid 2 was one of the first big name PS2 titles and just about everyone by now has played it. And that's probably going to be the deciding factor, as new beats old, in this match. But it is FF6, so watch out.
Hard, but MGS2.
May the best game win.