Which edition to buy
The Ultimate Edition bundles the expansions and add-on content with the base game, and because the game is old enough to discount steeply, it is usually the sensible purchase rather than the extravagant one - the gap between the base game and the full bundle is often small. Prices at the top of this page are live from Amazon; check what the bundle costs on the day rather than assuming.
One caution: because the series has multiple entries and several editions each, it is worth confirming you are buying Borderlands 3 for the right console generation rather than an earlier game in the series at a similar price.
How it plays at each group size
Four is the design target and the loudest version - four builds, four loot streams, absolute chaos on screen. Two is the most readable and the best way to actually follow the story, and it is the size split-screen supports. Three works, though as with most four-slot games nothing is designed around it - our three-player page covers games that are.
Solo is entirely viable too, which matters more than it sounds: a group game that is miserable alone is one nobody touches between sessions, and one where progress stalls until everyone is free.
Who should not buy it
Anyone on modest hardware. It is a large, demanding shooter, and the friend with the old laptop will not have a good time - our low-end PC guide is the right page for that group.
Groups with one hour. The pacing rewards a long session. For a short evening, the short sessions list is more useful.
Anyone tired of the writing. Borderlands has a very particular comic tone that some players find relentless. This is genuinely subjective and worth watching fifteen minutes of before four people commit.
How it compares
Diablo IV trades price and finality for crossplay, cross-progression and seasons. Deep Rock Galactic is the cheaper, tighter four-player co-op shooter with a PC-and-Xbox crossplay pool, built from short missions rather than a campaign - the better pick for an irregular group, and covered in our review. Helldivers 2 is the PS5-and-PC option with the strongest moment-to-moment action of the four, and no campaign to speak of. Review here.
Verdict
Borderlands 3 is the best four-player campaign you can buy cheaply, and the split-screen support makes it unusually flexible for a half-local group. The absence of crossplay is the one thing that rules it out, and it rules it out completely - so check platforms before anyone spends anything.
If everyone matches up, this is a lot of evenings for very little money. The wider lists are on our co-op shooters page and co-op campaigns page.