In my experience with the Meta Quest 2 and Quest 3, 128GB was sufficient ... The Quest 3 has a bigger battery: 5,060 mAh to be exact. The Quest 3S, on the other hand, sports a 4,324 battery.
Well, KIWI Design has a Meta Quest 3 and 3S accessory that fixes both of those quirks. The K4 Boost comfort strap also includes a built-in battery that adds an extra 2.5 hours of playtime.