I prefer photo tutorials because I usually have music playing in the background while i'm working on photoshop. I hate video tuts.
Photo is defenitely the better choice, as you can easily look back and follow the instructions slower. With video tuts, it's more like a lecture. Just have to keep up, but has a rewind option installed.
Video. Because in some "pic" tuts people leave ---- out or don't explain it well. With a video you can see every step exactly how it's done, you can watch one step, pause it, do it on your canvas, continue. And you can always go back if you have a problem.
Video tuts are often recorded with crap software. And you miss an important step because the vid was skipping. I perfer photo.
Naw, video tutorials help me alot more. I'm a visual type of guy. So the video tutorial really helps. Maybe it's just cuz I'm a noob. :\