Love Changi T3!
The layout, amenities, wide open spaces, greenery all make it very appealing.

Never really knew how good Changi T3 is until I went to different airports.
The ones in the US are simply pathetic.
Old, run down, bad design.

HKG is also really nice and fantastic shopping.
PEK/PVG, although new and functional, lacks appeal.

Heard that ICN is also up there but havent been there yet.