I helped my Stepfather to train and work Springers for years before I 'defected' over to Cockers. They can be quite different but I wouldn't go back to Springers now, much to his amusement as much as he likes the Cockers he thinks I'm 'making life unnecessarily hard for myself'
In my experience Springers are certainly a lot more forgiving of poor handling or mistakes on the trainer's part than Cockers are, you have to work harder to gain a Cocker's trust and respect but it's definitley worth having.
Training wise my dogs are all very different; my male dog is a bit on the soft side, I had hoped to trial him but unfortunately he lacks the killer edge required for this although he is a good working dog, is very easy to train and he enjoys what he does. He has run in a few working tests and he loves scurries etc. and he's now moving up to be my main working dog. My youngest bitch is a different kettle of fish, she's still only 6 months but is bold and confident and a natural worker while still being a lovely biddable girl and I have high hopes for her. She comes from a more FT background on her sire's side and more purely 'working', more unusual, outcrossed lines on her dam's side which was what really attracted me to her, she has a nice balance of the two.
There tends to be a lot of repetition in current working Cocker pedigrees, the same dogs crop up again and again and a lot of current and recent FTCH dogs are certainly overused and will be put to pretty much any bitch that comes along. There are also a lot of people breeding the dogs as pets or for things like agility etc. which I personally don't agree with and I would never consider buying a dog from these lines. A big 'trend' is litters with a well known FTCH sire and a pet bitch who has never heard gunshot in her life so it can be a minefield and a well known sire is not a guarantee of anything. It is difficult at the moment to find something a bit different from a strong working background and that doesn't have the same old same old breeding cropping up again and again which is why I was pleased to get my youngest bitch.
If you post up the pedigree of your potential dog and say what info you're looking for people should be able to help you.