If it were my rifle, I would go with the B&T. I have owned 5 or 6 B&T top rails over the years and they have all been great. I can't comment on the NEA top rail purely because I have not owned one.
I don't like how the NEA is steel or that it has an Aimpoint micro mount built in. I think the steel will add more weight over the aluminium B&T and the Aimpoint base is kinda gimmicky.
In the end it's your money, buy what you want.