I havee 2 6 gallon better bottles and just got a 6 gal glass carboy for christmas.
Better bottles are great. Light, durable, makes it easy to degas (not by pump though).
I'm using my glass for bulk aging. Currently filled with Malbec and will sit for another month or so.
I use my Better bottles for secondary fermentation and clearing. After that It can go to glass for aging if it needs it. Other than that I let things bottle age.
It's really a matter of personal preference.
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