They're great spells for my non-killing Restoration/Alteration/Illusion Mage, but the only difference I can see is the visual effect..
Repels are normally weaker than Turns of the same spell level, but, unlike Turns, can affect multiple undead in one casting as they fire in a small wave. You can use Repels for groups of weaker Dragur/Restless Dragur and use Turns on more powerful Dragur.
Thanks, you confirmed what I thought, i googled it before posting and someone somewhere said that repel makes them flee, turn makes them fight for you, but that doesn't happen for me, seems like it doesnt happen full stop.