Rendering out sequenced files is a must for me. Sometimes I have no idea how long its going to take or an error accors and I lose everything if I'm rendering one file like quicktime or avi. Plus tiff files have alpha channels. Alot of this would depend on what software you are useing for video as well. I used to render to 15 fps if I was in a rush. Video tape is always going to record at 30 fps. Cuts your rendering time in half.