If you're only going to bother doing one, then read it. Most of the arcs are better in the manga, the only arcs better in the anime imo are Universe 6 Tournament & half of Black, and there's just much more arcs. The best parts of Super have not been adapted into the anime yet imo, with maybe the exception of the Black stuff. But both the Moro & Granolah arcs are stronger than what came before it (again, bar maybe the Black arc).
If you're going to do both, start with the anime. Wouldn't worry about the first two arcs if you've seen the movies. The main reason to start with the anime is because of what makes the Black arc better. I somewhat feel if you read the manga version of that arc first, the strength of the anime version might be weakened. What makes the anime version stronger is the build up, the surrounding mystery & story around Black. The manga version is stronger when it comes to the actual conflict, in fact there's basically no mystery in comparison, so if you read the manga first, you might feel like the anime's just wasting your time since you already know all the details.