[IIsi50MHz]

Steaming retains more nutrients. Not only does boiling leach nutrients into water that is often discarded, it's easy and common to boil for longer than is necessary to make the item digestible.

Note that some things must be boiled to become safe; pokeweed greens can be boiled (and the water discarded) to reduce alkalinity. The berries, however, are never safe for human consumption.