I always use pre-wrapped
coils, but more out of laziness. I rebuild my Kanger OCC stock coils (I have the nano, so no rba for me). I tend to sit down for an hour and so rebuild about 10 at once, so I can just pop them in later.
I also use
fastech, typically
these, but I have bought others and some helix, and tiger coils there before as well. They are pretty accurate on there ohms from my experience. I always pay with paypal, so no worry about the credit card info being out there.
I highly prefer to wrap them myself, that way I can choose to wrap them clockwise or anti-clockwise and also choose the inside diameter of the coil for whatever I happen to be building. Takes me less than two minutes to wrap and install a set of coils and I suppose if I were so inclined I could build a dozen or so beforehand but I just prefer to wrap the coil right before it is installed so that I can build the coil to specifically fit the deck I am working with.
I find with many of the pre-built coils you end up trying to make the coil work as best it can for the deck you are installing it on, rather than specifically building my own coil to make the most of the deck I am installing it on.
What does wrapping clockwise vs counter-clockwise do? Legitimately curious I've never heard of one of the other before, and wondering if it should be something I should be looking at?