satpak77,
If you are flying a heading offset it means that you are aligned to the runway centerline however if there is a strong crosswind the aeroplane will still weathercock into the wind (i.e) appear to crab. So just by flying a heading offset just wont do. Thats why we are talking about these two methods.
Crab technique I feel is the best, however its interesting to note that when Boeings autoland they use the wing down method. Not sure about airbus.