There have been a lot of discussions of this topic in this subforum. You might want to do a search. You will find a lot of info.
I have tested five or six, and I find thus far that my newly received iFaraday is the pick of the litter! That said, I also must confess that I am always enthusiastic about a new one. When I have used it for a while, I will post more details. One very nice feature is that it is six inches long, while most others are too short. And it seems to be best for general use, including note taking by handwriting.
Good luck!
P.S. The Stylus-R-Us that Svenster likes is also a good one, but for me it as too hard to write with the extremely light touch required to keep its tip fibers from compressing an ceasing to work. The seller does provide a bit of velcro for "rejuvenating" the tip, but it's a bit of a pain. Of course there are many other fans of that stylus here who will undoubetdly share their experiences with it, so you will have to evaluate our preferences in terms of your own style and writing needs.