I'd definitely choose Goku @VinMcCarthy Being stranded on an island wouldn't really be a problem regardless if we were stuck there for some bizarre reason or not.
Goku's power would ensure our safety. I don't think anything on the island would be prepared to fight a saiyan let alone if he had all his forms at his disposal.
With how much he eats and how often he's hungry, finding food wouldn't be a problem for us.
Besides his power and the ability of getting food, he's also capable of calling the nimbus cloud, instant transmission, or even simply flying us out of there.
Goku would make the perfect guy to be stranded on an island with. Who wouldn't feel safe with the protector of the Earth looking out for you? ^-^