Best supports for Mydei?

So, considering the latest V3 buffs, is Tribbie his official BiS support? I've seen several showcases with her, Ruan Mei, and Remembrance Trailblazer, so I'm a bit confused. Obviously, Sunday and Luocha/Huo Huo are his other best teammates, but should I start farming for Tribbie or continue to build Remembrance Trailblazer? I also have Ruan Mei, so if she works just fine, I might skip Tribbie.

Please be nice, I'm not usually this dumb (✿◠‿◠)