I personally prefer the old thick glass over the thin. But that's just my opinion.
I'm not saying the new glass looks bad, it's just that, when you use the new glass there are these holes in your wall.
The old glass just looks a bit more fitting in my opinion.
I think for simple structures, with little need for detail, the full block is better. However, when you step into highly detailed structures that vary in shape detail, glass panes add that extra dimension that makes it fit better.