I'm not good at painting.
I wasn't good at painting even when I drew freehand, in fact I used a technique that didn't involve any color (China ink 0.2).
Once this youthful digression is over, I'll give you my opinion.
In my opinion the best enamel paints are Humbrol.
However, in Italy they are no longer sold because the European community has declared them harmful to health.
I bought a few more recently but they are leftovers (in fact I didn't find the ones I wanted nor the black and white).
They told me that Humbrol now produces enamel paints that are legal for the EU but are no longer as good as they used to be.
If you don't have these limitations, I think the (old) Humbrols have exceptional pigmentation and yield.
Now I will try the Italeri brand colours.