Hamstring, glutes and upper back. Romanian and stiff legged deads make me feel like I’m tweaking something. Snatch grip deads make my hams feel great and get my upper back sore, yet my upper back is not the limiting factor, which is why I like it. Just a newb’s thoughts.[/quote]
For the upperback, I think mat/block pulls are a far superior movement. They allow you to emphasize the part of the deadlift that overloads the upperback without having to deal with the full ROM.
For hamstrings and glutes, I feel squat variations do a better job than the deadlift. Glute ham raises are also a great pick.
In reality, I do very little deadlifting to build my deadlift. The majority of my time is spent with mat pulls and safety squat bar squats, with me only deadlifting once every 2 months. I think the deadlift is an excellent way to display strength, but to build a bigger deadlift, I train away from it.