Both are good in the sense that they are easy to clean and will not harbor dust and allergens like carpet.  Linoleum does have a slight smell at first that may annoy some but it is also antibacterial.  Hardwood often has some off gasing from products used in contruction.

FCS certified salvaged wood would really be your best choice as salvaged wood has already done it's off gassing.  You can also choose low VOC finishing products.