Depends on the sound you're looking for really. And that's extremely personal. Nobody can tell you that to YOU, such and such pickup sounds better. They can and do drastically affect how your entire setup sounds but what your preferences are, it's just not possible to tell you. It's like asking if Marshall is better than Mesa Boogie or if you should just stick with a classic Fender amp. Theyre all awesome in their own right. Depends on what YOU want.
I personally love the Duncan JB, but that's too bassy and boomy for most people. (Exactly why I like it. Thunderous chugging riffs). I'm not a fan of Dimarzios but again, it all depends on your setup and your personal style.
I think it's something to worry about MUCH later, for you. I wouldn't recommend you put too much effort into changing pickups now. I sold most of my gear and the only guitar I have left is a cheap one, wasnt worth it for me to keep the rest since I dont play out anymore. It has GFS (cheap indie guitar company) pickups in it it and I think they sound great. No need to go crazy overthingking what pickups you have in yours unless they arent wax potted and feed back like crazy.