I assume sumo deadlifts are just wide stance deadlifts with the grip in between the legs. Is that correct?

If so, I'm considering doing these instead of conventional deadlifts. I just started doing deadlifts two weeks ago, and I'm having trouble with the bar hitting my knees on the way down. Does anyone have any tips to prevent this or should I try sumos?

The reason I think a wide stance might be more comfortable is because I'm tall (6 feet) and squat with a wide stance.