Your inventory is not just a grid of items. It is the spine that almost every other system plugs into. Weapons, drugs, crafting, shops, stashes, vehicle trunks, evidence lockers, and your whole economy all talk to the inventory layer.
That is why swapping inventories later is painful. Item definitions, metadata keys, and the exports other scripts call against all change. Pick the inventory first, then buy scripts that already support it.
Three things separate a good inventory from a liability:
- Framework fit. It must support your framework (ESX, QBCore, or QBOX) cleanly, not through a fragile community patch.
- Metadata. Per-slot metadata is what makes serialized weapons, durability, registered IDs, and unique items possible.
- Server-side validation. Item moves, shops, and stashes must be validated server-side or you are handing duplicators an open door.