I'm very picky about two things when it comes to acquiring certain art supplies: lightfastness in all things, and pigment-based (rather than dye-based) products for inks and markers.

Most markers are an alcohol-based product, which means they are also dye-based. I don't buy alcohol-based anything, nor dye-based anything. They are not archival nor lightfast. For a detailed explanation as to why that is, this article (link lost, but the info is easy to find) explains it well, without being complicated.

If you're just screwing around for fun, buying products for children, or crafting things that don't need to last for the next 200 years, dye-based products are just fine. They do have their upsides, but they aren't appropriate for fine art pieces, unless you mean the piece to be ephemeral. Pigment-based products do cost more, but you're paying for their lightfast, archival nature.