I was down to the same two choices last year. I finally decided on the GIVI V35's with the solid mounting system. They're well made and fit the bike. The panniers go on and come off in a snap. They have a three point mounting system that holds the panniers very solid to the mounting frame with no noted vibration. The latching system takes a little while to get use to but works fine after you acclimate.
I just ordered the GIVI V47 topcase. Another nice feature is you get an extra lock set with the V35 Monokey panniers. Then if you buy a GIVI Monokey top case, at a later date, you can change it's lock set to match the keys on the panniers.
I tend to research and shop these things to death. Both the GIVI and H&B are expensive but highly rated. I don't think you will go wrong either way. If I remember correctly, the H&B set did require relocating one or both of the rear turn indicators. I didn't like that. The GIVI's just bolted on and fit fine. Either way, I think you will get very good quality. The price, well boys and our toys!