I'm a bit confused when I see that, that many people prefer glass bottles. I do like the idea of glass bottles, but I really do prefer tip cap, over eye droppers.
There's a lot of people in the vaping community that uses RDA's, and I would think that 99% of them uses plastic bottles, simply because of tip cap. Never seen anyone actually stress with a eye dropper when re-wicking the RDA.
I don't use a RDA, but since so many people do, and all of them pretty much use plastic bottles, I doubt there is that much of a difference between glass bottles and plastic bottles.
I'm waiting for glass and plastic bottles in the mail, and I'm still not sure what to use. I think I will go with the plastic bottles, simply because I prefer tip caps, and the eye droppers I personally have tried, has been really bad. They eye-dropper only fills up like 1/4-1/3 of the capacity, which makes filling really frustrating.
it's surely some difference, but not that big as people think it is. There's a reason why so many people use plastic bottles. If the plastic would effect the flavor that much as it seems people think, there would be an alternative for plastic bottles, except for the glass bottles of course.