Pac'sa little faster in the handspeed department, but we also have to onsider the other things Pac brings to the table like foot speed, agility and the southpaw stance.
Both have great speed but the big difference seems to be that Shane extends his arms farther because of his long reach.
Shane has faster hands in that he moves them faster in order to get set and fire. But he also has LONGER arms which makes the distance that his punches have to travel longer. Pacquiao has shorter more compact punches which arrive at the same speed or quicker than Shanes, partly because he has shorter arms.
Unless mistaken after mosley wins, his opponent would say Mosley is strong..... after pac wins his opponents would say....PAC is fast IMO, strength mosley>pac speed pac>mosley