Canned artichokes are processed and packed in a mildly acidic salt solution, so they need to be rinsed and dried prior to use. Frozen artichokes just need to be thawed out completely before being added to a recipe. As far as taste and texture, frozen may have a slight edge on flavor but tend to be a bit more delicate and more apt to fall apart than canned. Canned artichokes are readily available in the grocery store, and although they may (not always) exhibit a bit of a "tin" taste when eaten directly from the can, when added to most recipes it is not noticeable.