M-S brand has been around a long time. Decent paint but not maybe the best... Good for basic work in solid colors. Holds up decent. I think they may have different grades of paint.... can't remember right now.
Depends how long you want to keep the car and what level of finish you want... If you are planing to keep it a long time or show the car then you might want to look at DuPont or one of the other brands.
DuPont has several brands... Basic stuff to premium. Dulux Centari Chromalusion Imron etc...
Imron polyurethane enamel has always been one of their top end paints. Very good finish and very tough paint. We used to use it on motor cycle frames because it would take the abuse from the front tire better. It's also one of the most expensive paints. Even in the early 80's the stuff was $100 a gallon. If I remember right, you need about 1/2-3/4 gallon to paint most small to intermediat size cars.
Chromalusion is one of their new paints. Haven't used it. As I remember it's one of those color shifting paints.
Good paints are, usually, also harder to spray. You don't give paints like Imron and Chromalusion to a novice. Definitely NOT DIY paints. If you use some of these paints wrong they will ruin the paint gun. I believe Imron is still a two part paint and if you don't shoot the cup and clean it within the alloted time, it will set like an epoxy. Once that happens it is VERY hard to get out of the gun. It can ruin the gun if not removed ASAP. Think Epoxy. (If you mix in too much hardener it will also ruin the gun...)
Trivia... DuPont was one of the companies originally involved in the Fiero project. Fiero body panels were still under test at DuPont Chestnut Run labs even after GM killed the project. I've actually seen some of the testing. The mixed materials of the Fiero body presented Very difficult paint problems to the entire industry. (Alass... CR labs no longer exist.... DuPont tore down all the buildings "Inside The Wire" in the mid 90's. I believe DuPont has moved all paint testing to the Experimental Station and a couple other facilities.)
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Screamin' Yellow Zonkers... If it's Screaming and Yellow, I aint eatin it.