The titanium/ceramic is what comes with the Vaporbrothers Globe and Mini Viper. Glass Wick is fibers that wick the material vs the ceramic that comes standard. Some people prefer Glass Wick as it does wick material better yet the ceramic tends to tastes better longer. The Metal Case nail has tall side walls so you have less spill over and can put in more material if you want (but not recommended for prolonging nail life).
Titanium vs NiChrome is subtle taste difference, some say NiChome actually lasts longer while titanium tastes better. This is personal opinion and can vary based on what material used, etc...