Having something professionally painted, powder coated or rattle canned all have their place.

As far as spray paints, even though I use primer the majority of the time, I like spray paints that don't require it which is why I've been using vht roll bar & chassis gloss black for anything that needs to get painted black. I don't necessarily think it's any better than the other stuff but it makes it easier having the same color of black on hand & an extra bonus that it still works well without primer. It happened to be one of the first black spray paints I used for car parts so kinda got locked into it early on. I initially started with lower gloss/flatter black paints but noticed that most rattle can paints fade relatively quickly. So starting with a full gloss spray paint, allows it to fade to a more semi gloss/flatter finish.