I appreciate that glass blocks can be useful for structures while panes are better suited to windows that sit in the middle of the surrounding blocks but I still feel uneasy with anything in minecraft that detracts from it being purely blocks.
Notch had the perfect idea of Minecraft: Blocky and pure.
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Glass ftw ... But If I'm low on resources I will never think twice about panes ;3
Glass Panes are actually more cost effective. It only takes 6 glass blocks to make 18 glass panes. so if your making a glass screen wall it makes more sense to construct it out of glass panes. I also like the way glass panes work. It makes your window frames look more unsubstantial.
I generally use glass panes for flat windows, but for everything else, I use glass blocks. One benefit glass blocks has over panes is that you can recover the block with silk touch, but even that won't work on glass panes.
I voted for Glass, since I currently only use them in Survival - I didn't even know how to craft Glass Panes. After I voted, I went on the Wiki and searched up the panes. Then I felt like an idiot...should have made panes long ago, since I rarely use Glass for anything other than windows...