That’s a loaded question! Essentially, they are the same in that they are liquids that come in different colors and can be applied to varying surfaces. But from that point on, they can be vastly different.
I am assuming you are referring to the quality of different manufacturers paints. There are obvious differences between the different categories of paints, such as oil versus acrylics. Then there are all the different sheen levels that paints can come in. Sheen basically refers to the level of shine or reflectivity the paint has when it’s dry. Usually, the higher the sheen, the easier it is to clean, although some newer paints claim to be very “scrubbable” even at low sheens.
Then there are paints known as primers. These types aren’t meant to be exposed as the final surface. Instead, they are applied first, usually to a bare or already painted surface, to provide enhanced adhesion and act as a good base for the finish paint. Oil-based primers have been traditionally the best for this purpose.
But let’s get back to the heart of your question. Is one manufacturer better than another? Without naming names, there are 3 or 4 top manufacturers of paint products that are all in heated competition with one another. It is highly unlikely that one of them has a super-secret formula that only they have that gives them a great advantage over the others. So I believe that as long as you use one of these top companies, you should have no problem with the paint you choose. It’s kind of like choosing between a Ford and a Chevy. They both will get the job done so it usually comes down to personal preference and price. Selecting your paint is very similar. Good Luck!