soul spear is actually a little bit faster then ghost (or it seems so to me)
but its like (a bit random numbers)
1 second charge time for soul spear, then comes the hit, another 0.5 seconds until you can use another skill
for ghost spear the hit is instant, but then you have to wait 2 seconds before you can attack again
chains are great for pve or if you have a low crit weapon. but against an ice blader.. you will end up performing your chain skills for 4-5 seconds if your slowed down
the soul+ghost spear combo rocks in pvp, especially if you crit a lot