Lightning and fire.
Spear: higher damage, hp passive, but no block and so less survivability. (looks cooler IMO)
Sword + Shield: Lower damage, knockdown and Stab, block + extra deff from shield, no hp passive.
Nuker guide:
http://www.silkroadforums.com/viewtopic.php?t=7492
(hybrid) Sword+shield:
http://www.silkroadforums.com/viewtopic.php?t=7492