The + 1 will improve your healing more than any of the Myth token pieces armour. However before spending the tokens be sure to check out the Allagan Grimoir of Healing. If you're going Crit build this is actually better and has equivalent Magic Damage to the +1. So if you're planing on hitting up the high end progression faster you might be better Purchasing the Myth armor as they give you a greater Vitality stat bonus which might just benefit you more instead of getting a book you will trade in eventually anyway.