Nice question  you can use directly nbt or create a capability  whats the deal  NBT is data stored inside an internal database every time you recall data it has to create an NBT object and query the internal database to read or write data  Capability is a java object loaded in memory it recall data from the item internally uses NBT but only query  save/write data when changes are detected, capabilities keep loaded in memory until the item is stored or discarted  if you just