Legend Affix these are the Red Affixes you see on items. many can be rolled with the Ruby Crystal, and the rest of them can only be found on Legend Items. here is a post that has a list of what you can and can’t roll with Crystals.
Crystal Affix these are the Cyan, or Light Blue, affixes. there are about 20 of these affixes. you can roll them using the Obsidian Crystal or have a random chance for a Legend Item to have one. if the affix can be Crystal affix, and is on the Legend Item normally, then it has a chance to be a Crystal affix.
Legend WD% can get up to +200%, and can only be found on Legend Weapons, not rolled by Ruby Crystal.
Legend ED% can get up to +100% on any Legend Item, for a total of +600%, not rolled by Ruby Crystal.
at this point in time, there are no weapons that have both Legend +200% WD and +100% ED on it. also, there are no Crystal versions of these affixes.