For most players, the safest buy is the story DLC/expansion content first, then only the cosmetic packs if you care about skins. The smaller add-on packs are usually more “nice to have” than essential, while the bigger content drops tend to give you the most gameplay for your money.

What to buy first

  • Mad Ellie and the Vault of the Damned looks like the strongest pick if you want new missions, bosses, and meaningful content. It is listed as a live add-on and is part of the paid content lineup.
  • Legend of the Stone Demon is also a solid buy if you want more missions, bosses, and loot, since it is described as adding new missions, bosses, and rewards.
  • Bounty packs are better only if you want smaller chunks of content, cosmetics, and loot rather than a full expansion-style experience. Community discussion describes them as relatively small packs with side quests, legendaries, cosmetics, and a compact area.

What to skip

  • Cosmetic-only packs are the easiest skip unless you care about appearance items. The Ornate Order Pack is listed as an add-on, but nothing in the results suggests it changes gameplay.
  • If you are trying to save money, do not rush into every add-on at once. Some recent Borderlands 4 free updates, like roadmap content and boss/takedown updates, are coming without separate purchase.

Best value path

  1. Buy the big story DLC you are most interested in first.
  2. Add Bounty Packs only if you already enjoy the game and want more repeatable content.
  1. Ignore cosmetics unless you personally want them.

Quick recommendation

If you want the short answer: buy the story add-ons first, skip cosmetics, and treat bounty packs as optional extras. That gives you the best chance of getting actual gameplay value instead of just bonus items.

TL;DR: Best buy = story DLC; optional = bounty packs; skip = cosmetic packs unless you really want them.