What is the difference between investing in physical gold using bullion or trading gold on trading platform? What are the pros and cons of each?

-physical

pro: gold on hand, when crisis there

con: higher fees for buying and fees plus uncertainty of storing/safety

-trading

pro: cheaper buying, theoretically backed up by physical gold safely stored

con: relatively high annual TER costs, "paper gold" or "electronic gold", in case of crises, who would buy that and what if out electricity/telecom system crash?

maybe mix both worlds?

my gut feeling says: physical gold in small units (unfortunatly relatively more costs) would be best in use as crisis money