Well, I'm only in my second month of vaping, so studies are ongoing.
My kit is an eGo T. For the first month, that, with an atty was all I had used. At the suggestion of many here on ecf, I ordered some boge carto's, LR and regular. I can agree that when a carto is really working, their performance surpasses my stock set up.
The problem I've had with them is that performance degrades over a relatively short time. But a bigger issue, for me, is the constant dripping necessary to keep them topped off. Apparently, I need a little more practice with that, because I do flood them sometimes and waste juice.
My preference is a LR ATTY and eGo T tank (type B). The convenience factor for me, is huge. I find that I prefer type B to type A, and LR is pretty important.
So, that's my preference, as of now. However, as I write this, it occurs to me that it's probably more of a preference of the convenience of a tank versus anything else. LOL