I grew up with working Springers and my parents still have them. Generally speaking physically Springers are bigger than Cockers, stronger and more powerful overall. Again generally speaking they are easier to train than Cockers, a bit less stubborn and less sensitive and 'needy' and if you wanted the best all round, all purpose gundog it's going to be a Springer. For me with Cockers I love their character, I think they are more of a challenge and have more humour about them and I like their movement and I just really enjoy working them. There's a reason why Springers are so massively popular as working gundogs though, they do deserve it.