Form Of Physical

I'm looking to convert some shares of IAU into physical and debating the best type. Should I get a 1 kilo bar, or is there a reason to get 1 oz coins or something instead? If coins, would there be a reason to go with 1915 Coronas due to the pre-33 date or go with Eagles? If I later sell, it'd be all or nothing, so being able to sell part of it doesn't matter.