Well. I've played Deus Ex and Human Revolution. Both were fantastic but I definitely have to give the edge to the original Deus Ex, I think it was better for being super stealthy. Also it had the better music (HR had great music too but the original DE, just daaaamnn it's so good.)

I did attempt to play Invisible War a few times but I cannot get it to run on my computer at all, so... alas.