Trainability Comparison
Both Labrador Retrievers and Cocker Spaniels are intelligent and eager to please, making them highly trainable. Subtle differences may make one easier for specific owners.
Labrador Retrievers
Pros: High intelligence, food motivation, and bidability.
Cons: High energy and prone to distraction.
Cocker Spaniels
Pros: Smaller size, affectionate nature, and quieter demeanor.
Cons: Independent streak and prone to anxiety.
Conclusion
The easiest breed to train depends on the individual dog and the owner's experience and style. Consider your experience, lifestyle, and training approach. Every dog is an individual, so research both breeds and spend time with individual dogs to find the best match.