Hey, I have been trying out both with partisan gear power/alacrit Surge/crit. I took surge/crit personally like that much more.
Okey so here in our server TOFN is really good scoundis/OP which are running with surge/crit or power/alacrit
And all of them are hitting really nice numbers so my opinion is that what suits your play style best choose that.
Here is my stats
Cunning 3002
Endurance 2560
Crit chance 26.40
Surge 72.80
Bonus healing 972
Alacrit 471
ATM minmaxed with conquer pretty much need only 1 armoring piece but anyway not saying that choose these just wanna help little bit making the decision.
Here is some numbers that I have hitted=)
http://i.imgur.com/U9CVdmk.jpg http://i.imgur.com/9vbtJ2V.jpg
Usually ofc depends on map but in ranked its around 2.4k-2,7k HPS. Much easier get higher numbers in NWZ