Depends on the situation. Duoing with a monk in Sol B or KC basement? I'd probably use 70%. Full group with high dps against lower HP mobs? I might use the 50% slow or no slow at all. I really only break out the 75% solo or on longer fights. For example, duoing with a lower dps class like an SK in velks, 75% might be worth the additional mana.
Part of being a good shaman is getting a feel for mana efficiency. For example, in a duo pre-torpor you want to slow to an extent where you don't really have to heal. With a monk wearing fungi and regrowth in KC basement, 70% should be more than enough, so using the 75% is just wasting mana that could be used on other spells (e.g. less canni time, more JBB). If 70% isn't enough, then it makes sense to bump up to 75% since that is more mana efficient than having to cast a heal.
Basically, tailor your play style and spell selection to the needs of the situation.
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