Re: Best Spell?
Time control is very useful becuase you can use it from a good distance to your enemies, go up close and then cast your offensive spells up close to have a powerful effect while safe or almost safe under the influence of slow time. Also, with good high levels of this (and not too higer levels of said offensive spells), you should be able to get well on your way to casting the spell again before the first one expires.
Raise dead is also very handy (trolls being one shining example) when all the enemies seem to be too much. It acts as a lovely distraction and they often weaken your enemies for you to finish them off.
As for my favourite offensive spell for pure damage, shock. Statistically, shock is in fact the best spell because not only does it do the most damage, it also stuns your opponents. It only costs (I'm going by level 1 here - it may be different in future levels) 12% more experience than inferno to purchase so go for it.