By what metric? Use whichever one you like. Looks, rarity, usefulness, whatever you think is important (or not important). I would like to hear your opinions.
In my case, I’m going to rank them by usefulness in timewalking.
- Ashjra’kamas, Shroud of Resolve - Timewalking BiS for all classes (need to be at least rank 12 to have the proc effect).
- Dragonwrath, Tarecgosa’s Rest - Has sockets and a decent legendary ability, not necessarily BiS but it’s dragon themed and thus fits a bronze dragon pretty well.
- Shadowmourne - Again, sockets and legendary abilities. Pretty attractive performance wise but points deducted for not being dragon themed.
- Rae’shalare, Death’s Whisper - Lets you skip the Wailing Arrow talent if you wanted to take it and still have the ability. Currently a harder to get as SL raids aren’t soloable.
- Val’anyr, Hammer of Ancient Kings - Not a BiS by any means, but has a nice effect that puts it a cut above your average stat stick.
- The Twin Blades of Azzinoth - They have a bit more stamina then same level weapons, as well as a haste effect, but the attack power vs demons is only really useful in the Black Temple and they’re too low ilvl to be useful in Legion TW.
- Fangs of the Father - They have a socket and a niche slow fall effect, that’s pretty much it. Set effect is disabled.
- Legion legendaries - Although their effects are disabled, the crafted Legion legendaries stand out as they have 3 sockets. The rest are just run of the mill items now.
- Shadowlands legendaries - Their effects are disabled outside of the Shadowlands so no use for those right now. If they still have their effects when SL timewalking comes around this might change.
- Thori’dal, the Stars’ Fury - Since ammo isn’t a thing anymore, it’s just a regular bow now.
- Pandaria cloaks - Actually BiS for some classes but unobtainable if you haven’t played back then so screw that.
- Warlords of Draenor rings - Unobtainable and their effects depend on other people having them so… yeah.
- Thunderfury, Blessed Blade of the Windseeker - Low stats despite an ilvl that seems sufficient for older TW events as well as obsolete resistances instead of proper secondary stats. Effect doesn’t look really great either.
- Sulfuras, Hand of Ragnaros - Same as Thunderfury but even lower stats.
15 Atiesh, Greatstaff of the Guardian - Although stat wise it’s better than the other Vanilla weapons, it’s not that great still and is unobtainable so lowest score from me.
Honorary mention to Heart of Azeroth which isn’t a legendary but it’s necessary to enable Ashjra’kamas as well as other BiS Azerite armor and it also scales with level now (up to level 60 currently) so that’s another good point.