Buyers often line up quotations side by side and pick the lowest number. That works only when every quote covers the same scope, and frequently they do not.
The price covers goods, local transport, export clearance and loading onto the vessel. Ocean freight, insurance and everything at the destination are yours. Best when you have your own freight rates.
Adds ocean freight to the named destination port. Insurance is still your responsibility, and risk still passes at the port of loading, which surprises people.
Adds a minimum insurance cover. Check the level of that cover before relying on it, since the default is often lower than buyers assume.
Ask every supplier to quote on the same Incoterm and the same destination port. Once the scope matches, the remaining gap tells you something real about the goods.