First of all, let's make some assumptions, you are approaching end-game gears, you are pvp lover, you need to be P2W in some sort or super brilliant on earning kinah and such.
Ultimately you should be getting 4 sets, MA/MB, SR, MS, and MB/MA. (piority in place, and will give more reasoning below)
In terms of weapon, you should ALWAYS go for attack speed weapon even if you are playing with 200ms+ ping. So at this stage provenance spellbook/orb is your ONLY choice for pvp even in 5.8.
For aggressive set like MA/MB, MB/MA, 75ap armors are essential. The only difference would be ma