Mostly people choose the light imbue because like you said it has more damage then ice. But your right it may also lure more mobs on you possibly killing you. But think about this your main nuke will be light so either way your going to do splash damage there's no way around it.
About your weapons here are some pros and cons...
S/S:
-Pros-
1. It has a shield meaning more def + the chance to block an attack entirely
2. It has knock down + stab which is a huge help if your up against someone and need some time to repot just knock them down
3. It's better at PvP then spear
4. It looks really sexy
-Cons-
1. S/S nukes aren't as powerful as a Spears nukes. But you do get more def while sacrificing some damage
2. Not as good as Spear in PvE
Spear:
-Pros-
1. Insane amount of damage for a Chinese char
2. It has knock back giving you time to repot, cancel one of their skills or fire of another nuke
3. It's better in PvE then a s/s
-Cons-
1. Less def so you'll die easier
2. Not as good as a s/s in pvp
So yeah I hope that helped it's early so if it didn't make any sense my bad
