IMO, anything not SPD.
I like any of the Crank bro offerings by line, but some of the cheaper models are, well, cheap.
If you like the speedplay free float feel, Frogs are great. They're what I use when I need a treaded shoe. If it's only for occasional use, they are rather more expensive than other choices.
"Platform" is irrelevant if your shoes are sufficiently stiff. If you want a shoe with some forefoot flex for the sake of walkability, think about a pedal with some platform.
Really no bad choices among the rest - though I do despise spd. Maybe that's just me.