http://www.silkroadforums.com/viewtopic.php?t=19902
Read up on that and make the choice for yourself. ^.^
S/S uses shield, duh...but w/ that it provides higher mag/phy defense...as well as block and if you have block parry ratio..or w/e it's called....ppl won't crit you as much....and don't forget the most annoying skill KD. =D
Spear hits the highest, but also dies more easily....it does have more hp than s/s, but in trade it gives up defense.