I honestly prefer Meaghan Jette Martin a little over Brittany Snow, it's just a little weird to have both in the same game. Xion's voice is fine. It's not a very demanding role. Whether it's intentional or not, the emptiness kind of works. Terra is maybe my least favorite in the series, but he's usually alright. He handles the loud parts and the quiet parts excellently (better than the Japanese, in my opinion), but doesn't really know what to do with his voice in the grey areas. Aqua on the other hand has one of my favorite voices in the series. A little rough around the edges (in terms of professional training), but I find it very genuine and endearing.