Hi Yazee,
Interesting questions which we have discussed before on this board and I still don't think there is an answer - I think they would have to cancel one another out but I don't know of any reliable way to test that theory.
Personally, I prefer protection from spells over swords - so I think it is a matter of your own preference rather than one really being better than the other.
There is no suitable protection from rubber chickens. Pity!
Wyv