Donut is amazing for yakety-sax moments. Also has the sing. Good for the odd occasion, but to awkward to be a mainstay - even with fancy diagonal movement.
Cog1 is cozy. One main hallway and a few staging areas.
Cog2 is amazing, but it was built with a higher pop in mind. Since I play on lowpop a lot it does seem spacious. It gives a bit too much agency to some antags.
Destiny/Clarion is interesting. I'd like to see them under lljk2's brand of ARRPEE.