SS21 - Most Common Ink Type, Used For Making Outdoor Durable Signage, Good Scratch Resistance, Mild Solvent Based
ES3 - Less Common, Less Outdoor Durability, Less Scratch Resistance, More Environmentally Friendly, Used For Making Outdoor Signage but Lamination is recommended, Light Solvent Based
BS3 & BS4 - Mysterious solvent based ink that doesn't get sold in America. I know nothing of this ink other than it is a solvent based one.
You may want to check into a brand that is more known for photography and fine art prints. Solvent based inks are made for durability and do not have the same color gamut and quality as water based pigmented ink that you should be using for photography type stuff. Mimaki is a great brand but this is not their specialty. Epson, Cannon and HP are the brands I see most when it comes to photography.