Sennheiser: PX100 vs. PX100-II ?

Help me. I really don't know which one is better. I'm 17 and I listen to pop, r&b, hiphop, alternative, acoustic and etc. I like bass. I don't really need closed back since I'm going to use this at home, I just want to know which is better among this two. Quality sound, durability, comfort, worth the money, etc. =)