I’ve got both the plastic and the glass Big Mouth Bubblers. I can say unequivocally that I prefer the plastic. Here’s why:
–I had to get eight stitches on my left thumb because I broke a glass carboy while cleaning it. Now any time I use the glass bubblers outside on my concrete patio I’m convinced I’ll shatter one just putting it down. That’s just not a concern with the plastic.
–The plastic bubbler is lighter. It’s not a huge difference, but it’s noticeable.
–Like many people, I had a leaky lid at first. I solved that problem with a thin smear of keg lube around the outside of the plastic lid. It was such an easy fix that I genuinely don’t understand why people complain about the lid.
–The port on the top of the glass bubbler is undersized and can’t accommodate a thief for taking gravity samples. I also like the double-port option for the plastic bubbler. I don’t presently do this, but I like the idea of using gas to push the beer into a flushed keg someday.
–I like that the plastic bubbler is taller and skinnier than the glass one. I can fit the plastic bubbler in my fridge next to my kegs when I brew lagers, which I can’t do with glass.
–I’ve never had any sort of infection or other contamination problems using the plastic.