We were considering getting another dog recently, and heard of a litter of Labradoodles for sale. When we said that we were thinking of getting one, we were inundated with comments about breeders being awful and rescue dogs being the only way to go.
As it turned out, the last doodle had gone when we tried to see them, and we are still 'between dogs'; but we had decided against a rescue dog as we wanted a puppy that my husband could train. He is good at training dogs (he comes from sheepfarming stock), but prefers to start with a puppy.
Also, friends of ours have had no end of problems with a rescue dog (and yes, I realise that it wasn't a representative sample), as he had been ill-treated and neglected. He growled and was aggressive to everyone who came near him, and destroyed anything he could chew.
We had tried a couple of times to rehome one from our local shelter, only to be let down at the last minute. We had set our heart on one, and been in correspondence with the shelter, only to find that during this process he had been with a potential owner for a trial period. The shelter don't like to put others off in case things fall through, but we were really disappointed not to get him. Also, shelters rarely have puppies, as it us usually after an owner has had a dog for a while that they realise that they can't keep them for whatever reason.
I don't think that there is anything wrong with wanting a particular breed, either, although we were made to feel selfish or shallow when we said we really wanted another labradoodle. A dog has to fit with your family, and if you are not comfortable with a breed it is perfectly ok to want a different one - it would be irresponsible to take the wrong dog for you. Obviously, shelters can't provide breeds to order, and it could be years before they have a dog that will be right for you, so if you don't want to wait, a breeder can be the best bet.
I was quite surprised at the number of people who insisted that a rescue dog was the only way to go, even when they didn't seem to have considered any of the things that mattered to us.
I would say that there is no real right or wrong in this case - do what works for you, but think it through first.