Yea I think that I would choose Bella's shield. I just love the idea of being able to protect the ones that I loved. I know that it doesn't seem like that much of a power but that's what I would choose.
Yea I think that Edward's power would just get on my nerves and having all the voices in my head would drive me crazy!!!!! and Alice's are nice but since her visions are subjective I not sure that I would be able to stand it when someone keeps changing their mind.
So yea I would have to choose Bella's shield.