My $.02USD:
There are always questions about plastic. Even Better Bottles are questionable when using vacuum for racking/degassing.
The appeal of plastic seems to be price. If you consider the price of the carboy to be a one time cost, then over time the difference diminishes. With glass you don't have to wonder if you'll taste plastic. You don't have to wonder if it will stain or whether or not you can use a carboy brush on it.
IMO, the difference in price isn't worth it. I only use glass carboys.
I rack and degas with vacuum and don't worry about it. If I have to pick one up, I don't worry that it will bend or cave or that airlock liquid will get sucked in.
BTW, I prefer glass