Over the years, I've had lots of experience of Show and Working Cockers and am surrounded by both types daily. Usually courtesty of my visiting mother.

Never, ever had a problem with either type for house training, you just have to train them properly and consistantly as with any other dog, but they are not known to be difficult and believe me I've trained a lot of them, the Show obviously take up much more time with grooming and pampering especially if you should be interested in showing, but even if not they do need a good brush through and trim quite regularly. Unless you have all their feathering trimmed off and then not so much to worry about. The Working breed just a quick brush, not anywhere near as much attention, some lines don't even grow that much at all.
IMO, (well actually it's a fact) Shows are slightly more vocal than the Working Cocker, even though both types love to swim, once dry I've never noticed any smell, but feet and under belly have always been washed, whether that makes a huge difference I don't know, but I've always had comments that you can't smell dog in my house, even though I can daily have 8 visiting at one time. So I would not say that either types of Cocker are smelly.

The exercise thing is what you need to concentrate on though, Working need much more as already said on the other post.
There isn't too much difference when Cockers are mature, bitches do mature faster though, my mum's males are always willing to please, tail always wagging, whereas the bitches although enjoy sitting on your lap and having the odd pamper tend to enjoy independance too.
some of the Working Cocker bitches (not Show) can get a bit of a stubborn streak though, and when you ask them to do something they look at you as if to say "You do it!"

But neither are difficult to train at all, as a breed they love to please and I've always found them very easy.
All in all, they are a pleasure, not really any dog on dog problems as they are not dog aggressive, or large enough for other dogs to want to show authority over, very friendly with people and other animals.
The Working as long as from a good breeder you will be ok, the Show which you will have much more breeder choice of be extra careful to get the best temperaments.
All in all, it comes down to exercise, and grooming. Personally having a young family the Show lines would be better suited to yourself, the Working pups are more full on than the Show so I think that would be your best bet.