With the current meta, is a debuffer/healer build(with windsweep 3) viable or should I go for the more offensive Poison dagger+ build? My PA Olivia is +Spd -Res
Poison Dagger is quite effective, especially with an Atk boon. The Spd boon improve the Smoke Dagger+ viability by a lot, by running Windsweep (in combination with Savage Blow skills&seals).
So I'd say go for the Smoke dagger+.
Disclaimer : I believe +Atk boon and Poison dagger+ build is the optimal skill set for P!Olivia, since it lets her run effectively WoM and double the potential of her A-skill (Death blow or Life & Death 3, etc).
Just like the first reply, if you have +spd then a windsweep set makes more sense since you can proc windsweep more often. If you have+atk then its recommended that you go poison dagger since she will do a good amount of damage with it and Life and Death, Death Blow, Swift Sparrow etc. With your current IV's though, windsweep is a great option and I couldn't recommend it more.
Good luck with your builds Summoner!
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes