I keep going back to the Knucklehead. It's on my Patriot
rda right now. It's the most comfortable drip tip I've used, and I've used a lot of them. I like how the tip bends toward my lips.
I'm not generally a fan of metal drip tips; they can get warm to the touch on the lips and collect lip burgers. I also don't like the feel of metal on my teeth.
I like pyrex (glass), feel good on the lips and are pretty, although they are not very durable. I like TruStone. (Check out the acrylic and TrueStone tips at
Drip Tip Designz.)