Fury is more fun, and better later on i think.
With zunder you'll have to shoot them just as they spawn so they won't overwhelm you.
Though I hate it when they spawn on top of you suddenly.
I think that this was the first card that wasn't extremely easy. 4/5, good gameplay though.
Anyway, once you get the hang of shell-juggling, you're able to keep it up for longer and longer until you hit 20. First level IMO is easiest for it.
Just wait till it's still, jump on it and keep on hitting it with a jumping header, trying to keep it going straight up every time. Good luck. :P
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