I have both of these dvds and they are very different. Sebastian's is good, he does quite a few hymns and breaks down a whole lot of theory and shout moves etc. It is like 10 houds long.
Jamal's dvd teaches less songs, but he shows a lot of "phat" moves, some that will be easy to apply to actual songs and others that you can use during talk music or transitional music.
If you are a total beginner and dont know much theory and hymns, then go for wheatworks, if you canalready play piano and want to do some cool stuff on the organ then get jamals