It's hard to recommend stuff from Swans because the early stuff and the later stuff are totally different.
The early music was really harsh, heavy and slow. It was basically a combination of post-punk and old noisy industrial music.
The later stuff is much different, as it features more than one vocalist and has a lot of softer, more lush and beautiful arrangements while still managing to retain a lot of the emotional intensity of the earlier stuff although the musical style is pretty different.
I like the later music more, because there was more thought put into it, but I still enjoy the earlier albums as well. They're definitely one of the best and most important bands of experimental music, art rock and post-punk.