The 1st one is a scientific answer because it can be proven and answered in a scientific manner however are dogs better pets than cats is an opinion based question and has various answers due to what u like
The difference between these two questions is that one has a scientific answer for that question. The one that says, " Can dogs identify colors?" is scientific because it can be answered scientifically but the one that says, "Are dogs better pets than cats?" cannot be answered scientifically. ~Hope that this makes since and helps