I would avoid the Kingston Fury and Corsair Vengeance memory kits if you're going to run a Ryzen platform. They both have a pretty high incident of not playing nice with Ryzen hardware. Even if you see the model on the motherboard QVL, it means nothing with those kits because both Kingston and Corsair tend to randomly change the ICs (Memory chips) used on those series so a kit with a specific model that works fine with a certain board/CPU one time may well not do so the next time because it's composition may be changed from one production run to the next. It happens quite frequently and we see a lot of those situations.
I'd recommend sticking to G.Skill Flare X, Ripjaws or Trident Z5 kits AND I'd make certain any kit you buy is one that G.Skill says is compatible by looking at their Memory Configurator first. Otherwise, I'd stick to the higher end series from whatever manufacturer you DO end up buying from and in that case, aside from Corsair or Crucial who both have their own memory compatibility lists/utilities, that any kit you buy is actually on the motherboard QVL list. Generally speaking the higher end the kit is the less likely it is that they will just randomly switch ICs used for that model and that matters because those ICs have much to do with whether a given kit plays nice with specific hardware or not.
As far as the motherboard goes, myself, I'd recommend sticking with the Aorus Elite AX. I have several of them from several different generations of both AMD and Intel platforms and they have all been solid boards. Reviews seem to indicate THIS particular Aorus Elite AX is pretty solid as well.
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The Mortar boards have been fairly decent in the past, but I wouldn't put them on the same level as the Elite AX.