Schönefeld definitely won the award for most disgusting airport bathrooms in western EU, and most kafka-esque narrow winding hallways that may or may not be taking you where you want to go.
I loved Tegel - mostly used the parking structure-turned-into-terminal barracks thing though.
Fast in and out, even with the X10 bus connection.
The main terminal was weirdly narrow on airside, but from memory apart from having to stand to drink beer was just fine.
I liked the currywurst carriage outside by departures if I was ever more than 30 minutes early for my flight.
Schönefeld on the other hand … grr. I argue that that airport was exceptionally poor in a way I’ve never experienced outside of corporate airports used for industrial and mining facilities.
