The T3i has a higher resolution screen (1040k dots instead of 460k dots), a larger sensor (50% more), for DOF, lower noise at high ISO, 24fps (gives a more filmic look), a flip-out screen (good when trying to get low and high angles, longer battery life, and better color depth/dynamic range. All of which are great advantages when shooting video. Although one advantage of the GF3 is the continuous focus capability. But aside from that, the T3i is a far better camera for both video and photography.