As a pro dogwalker and carer I have experience with all of these.
All dogs are different, however as a very big generalisation Labs are brilliant family dogs. However they do moult, and they adore mud. Don't think about them unless you have an outside hosepipe and a utility room that you can access direct from the garden where they can be towelled and then left to dry off a bit.
Cockers are also good family dogs, but they want to work, and will instinctively go nose down and off in search of rabbits etc, at which point they go deaf. However they do respond well to training.
Golden Retrievers, certainly show-type ones rather than working line ones, moult worse than almost any other breed I can think of. And they like hurling themselves in filth. And all the ones I know are sweet, but deeply dim.
Flatties are absolutely beautiful. But as pps have said, cancer is a massive issue in the breed. A lot of work is being done by breeders to try and clear it back out though.
They do like water and mud but the coat isn't quite so thick and difficult to care for as the Goldens.
Pure bred poodles are wonderful dogs, very intelligent.
If you do go for one of the doodles or poo crosses, really do your research about the breeder. I know one lady who breeds a litter only every three years or so, her cockerpoos are great examples of family dogs. But I know of far more who seem to have ended up with the worst traits of both sides and there are terrifyingly large numbers of dodgy bastard breeders involved. They're entirely capable of temporarily moving a litter of pups into a nice warm family kitchen to make it look like they're home bred just for the day that innocent punters come to look before sending them back to the dirty sheds that they really force them to live in.
The pointer type groups do have the benefit of much shorter easier maintenance coats. However all the young Vizlas I know are completely bonkers!
English pointers are very shortlived 
German and Spanish pointers well worth considering.