Here we go! Different schools of thought on this, and some decks (harder or softer wood) work a little better with various inserts.
I prefer to use the stainless ones though. EZ Lock inserts are a pretty nifty little system too. @mmanerjust got some of those and had some good luck with them.
I feel like a lot of different styles work, but the right size hole is paramount. I always recommend doing a test hole in some scrap wood that you have around that is (hopefully) close to the same density as the deck you are using, or at least relatively close.