Well I am still confused because I did some research and found out that for example:
People on arenajunkies say that on s8 (yeah I know its not yet s8 on sunwell) mana regen from spirit gear is not needed at all because of increased mana pool, dispersion, shadowfiend and VT+MB combo giving you mana back. Also shadow priest in 2v2 is better suited for double dps comps, so games are rather short.
Also there is a guy on arenatournament and warmane called darthsotek, who play in full satin, with crit trinket, no meditation talents and got godlike winrate in duels (I know that game is not balanced around 1v1 battles but still) which I found impressive.
I also found a guide about dueling unholy deathknight as shadow priest which is commonly considered by many players to be priest class hard counter, and in this guide author says that mooncloth gear with solaces for more regen cant help u at all because DK will outlast you anyway, but if you go for crit gear and talents (yeah shadow priest got crit increasing talents) you might be able to burst him in cc chain.
Another example is that I found some shadow priests in game, here on sunwell, who were wearing satin gear and had like 2000 rating in 2v2 (cant check this anymore kappa). Yeah I know its nothing special but still.
I have never tried to play in satin gear and I always blindly buy mooncloth with haste offsets, as previous poster said (and most pvp guides for shadow on internet say that u should go mooncloth), but as I wrote above I am still confused.
Also I feel that double solace is better suited for defensive playstyles (disc priests maybe) and would rather go more offensive options like double haste trinkets. DFO + CTS in future content are kinda scarry if u ask me. Or maybe I am totally wrong and shadow priests should only be played with defensive playstyle in mind?
Maybe I should go affliction Kappa
Still confused af