From what I've been reading and talking to others about is that cartomizers produce better flavor when used. I wouldn't worry about getting a different
juice unless you got if from somewhere other than what you've read in the forums. You can find tons of places to get good
juice on here. Tasty Vapor, Vaporbomb, V4l, freedom2vape, Madvapes are some of the names you might come across. It just depends if you want to use cartomizers or atty cart combo. I just ordered some cartomizers but have yet to use them. But just like you have noticed, they give better flavor. The down side is the atty's inside aren't meant to last as long as a regular atty. It's all about what you prefer Stv. Experiment a little and figure out what works best.
I've also heard that LR atty's ruin the battery. I'm not sure on this one either, its just what some people have been talking about.