my name is anavidfan, and Im a "tip-aholic"
Ive had glass, acrylic, stainless steel and now those Titanium ones above. I have not found a difference in any of them in the way they feel on your lips. Some say that metal heats up and feels uncomfortable, but since I vape at cooler/warmish temps, I have not had that problem. Some say it tastes "metallic" maybe wtih metal tips not made of good quality stainless steel or maybe they didnt wash the stainless steel ones in warm water with a little soap to get rid of any residues of tooling oil.
I dont own glass tips any more because Im a clutz. If you do vape at higher temps glass would heat up also, plus like the first tip up there, the grooves would act like a heat sink and keep the heat away from the actual tip. These are just my thoughts and experience , yours and others my vary.
I love stainless steel tips. The ones in the photos are made of Titanium, and then those are heat treated to get the colours. Also the guy that makes those hand turns them on a lathe so they are all unique and one of a kind. He can make the same style but they are always just a bit different. Also the heat treatment for the colour will never me exactly the same on another tip.