If possible, keep one of each. The cordless will be great for when you have no choice but move around a lot while working (ie: a deck or outbuilding) but the batteries are almost always dead or dying when you really need it for something quick. And I have found that corded are almost always much more powerful for the same price point.
[–] M346 ago
I recently got a cordless drill as a present, before that I was fine with my drill with a cord. The cordless one is okay too. My cordless is probably a bad option for mixing stuff but I need a larger drill than my corded one for that anyway.