@RhyLe: no online feature, gyroscopic lang and 3D ila gi add, if you have played MGS3 in ps2 don't bother kay its a remade port although the graphics looks better.
Between RE and MGS? Go for RE its like having two games in one. 1- a solid single player mode 2- an arcade online feature like mercenaries but with better graphics.
MGS must be played using the Circle Pad Pro as the controls w/o it are that bad. RE is manageable even w/o the circle pad pro.