It depends on three thing: One, How comfortable are you with spells; Two, How strong is your mind while manipulating energies; And Three, How big is your task?
I personally would, for a small task, just use energy manipulation. And if the task were too much for just my will to handle I would resort to spells.
If you chose to just manipulate energy, remember to have a calm mind and soul before you start. Meditating helps with this.