Don't get a collie unless you plan to spend a lot of time walking it, playing with it, and generally entertaining it.
Collies are amongst the most intelligent of dogs, but if they don't have anything to keep them entertained then they will get depressed, or unruly. They were bread to be working dogs, and need something to keep their minds occupied.
Labs are almost the opposite. Quite happy doing very little, but prone to getting overweight. Seems a bit of a strange shortlist to be honest being as they are such different temperaments.
What I would say though, is check the local rescue places, don't feed the immoral puppy farming industry. Mongrels are generally healthier dogs than so called pure breads.