I have a d-nail set up as well that I stopped using because it is nowhere near as good as the liger.
I think the difference in flavor is attributable to the thermal dynamics at the dish level. The dish is too exposed in the d-nail and you get a lot of splatter losses. Furthermore the carb caps on the d-nail absorb a ton of energy from the dish, and are nowhere near as sophisticated as newer options.
Again it's only an inch and a half of air path and titanium is not very reactive. You're going to see more of a difference based on the thermal properties, the size, and the shape.
I have a several boxes of titanium and quartz I tried them both.
I have some ideas on how Josh could improve the next version however I'm worried that miss information regarding the use of titanium might be a factor in driving him to leave the business.
Again I experienced the shit that shooby was talking about and I determine that it was a failure of the coil under high pressure.
I have tasted the same bad sharp taste from quartz before. It has everything to do with dynamics of the dab temperature, vacuum, and wind speeds. If you get the same taste from using quartz at the wrong temperature than the problem is not titanium. There is a lot going on chemically in the dab. You have a big variety of chemicals, some of them are weak chemicals that degrade easily. The thermodynamics at the dish makes the biggest difference in what the chemical components are of the vapor. It has nothing to do with the titanium acting as some kind of catalyst for chemical degradation. The wrong temperature is really will give you a different experience and different chemicals / flavors. Things must be dialed in for a comparison to have any validity.
Well I don’t own a liger, but I do own a d-nail halo, and after switching to an all glass path, when I went back could I ever taste a METAL taste. This isn’t in my imagination—it’s real—I find it similar to drinking out of a metal can or cup vs a glass bottle or cup. There is a taste difference ... and you can taste the metal for sure ... glass is simply more neutral.
Anyway ... that’s my opinion. Unbiased.