SPD M520 vs 530

I've just bought a new commuter/gravel/fun bike, now looking at pedal options. I'm used to SPD-SL for road riding, but figured for getting to work SPD's would be better so I don't have to walk across the carpark like Bambi on ice every day.
Is there much difference with the cage on the 530's? Does it provide any noticeable extra support compared to the bare mechanism of the 520's? Or is it more there just for impact protection out on trails?
Or does anyone have any other recommendations for a decent all round SPD pedal?
Is there much difference with the cage on the 530's? Does it provide any noticeable extra support compared to the bare mechanism of the 520's? Or is it more there just for impact protection out on trails?
Or does anyone have any other recommendations for a decent all round SPD pedal?

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They are single sided and the surrounding cage does provide more support for your feet.
I must say that I prefer the 540's though, a hex key to fit/remove pedals is less annoying than using a pedal spanner. Apparently the bearings are better as well.
Close copy of Shimano M540s, drops a useful 150grams vs a pair of M520s and are £26 before BC discount at Halfords. Hex key to fit/remove, look considerably sleeker than M520s on a road bike too. I doubt they will last as long as a pair of M520s but what does.
No need for cages, just get decent shoes.