Everybody always asks about what book, or what movie, or what music, or what food, or what [insert item here] you'd take with you to a desert island. But nobody ever asks about the island! So, two islands:
Island A is a large island with good vegetation, varied topography, a sheltered cave, and a lagoon or two filled with fish. It is, however, very far away from the nearest shipping or air routes, so rescue is less likely.
Island B is a small island, not bare but not rich with vegetation either (maybe a copse or two of trees with smaller plants around), little natural shelter, and deep surrounding waters that don't yield as much fish. Long-term survival will be a significant struggle, but the island is close to shipping and air routes.
Which island do you want to get stranded on?