I am a new brewer and read up on this.
Glass: Easy to clean, lasts forever, heavy, no possibility of plastic tainting your brew.
Plastic: Light, easier to store, degrades, could get scratched and harbour bacteria.
I got a deal on a 23lt glass carboy which is full of betterbrew export lager where it is ageing.
Organising the large cupboard which I have taken over for brewing i nocked over a pile of empty 33cl bottles one of which bounced off the fridge and pinged in a graceful arc onto the carboy.
My carboy looks like it has beens shot. A tiny crack and beer leaking. An emergency application of plasterers sickytape has stopped the leak but it is finished I think.
Back in the day my parents made wine and the carboys were all in metal wire baskets surrounded by straw and cloth.
I think it is plastic for me from now on. Accidents happen. Gutted. Will bottle next weekend and say goodbye to my glass carboy. I hoped we would be together for many years but it was not to be.