The collector sets are better quality and unless you are paying retail can be gotten for less than the 3 individual volumes.I recently watched the 40 min youtube documentary "Berserk - More than Blood and Guts" which covers all the output (Manga, Anime and Video Games).
It caught me off guard as I was not expecting such a deep storyline and I am definitely no dark fantasy reader. However, I think I am going to take a tour to our nearest Manga and Comic book store tomorrow to see if I can get an example. It would be odd to buy the ultimate edition right away, so easy does it for me.
I do have a question for the experts here: I dont know if I got it correctly from the documentation - is the manga starting off in a different way that it is heading further down the path? For example - is it one of those "oh you have to read until chapter 10 until it gets good" mangas ?