the T240HD is 1920 x 1200 so it has a higher resolution. It also has a TV tuner for watching TV, but I am not sure how well HD channels would work on a 1920 x 1200 resolution because it is smaller, but for PC gaming it is definatley better. The other monitor is 1080p (1920 x 1080) and is 16:9 ratio instead of 16:10 like the T240HD so its wider and shorter, but its resolution is smaller. 1080p is "true HD" though so HD gaming consoles and videos will fit perfectly. IMO if you are a PC gamer get the T240HD for sure and if you are only playing games on it (not TV) get the T240 (same thing no HD tuner). If you wanna watch TV or console gaming get the other one.