Highlighted weapons are free options.
Calculations assume Bennett. Yanfei is a Charged Attack damage dealer that utilizes a stack mechanic to increase the damage of her Charged Attacks.
Yanfei typically does as her combo to maximize her damage, especially during her Burst state. With two Hydro characters, this results in consistent Vaporize hits. However, if you only have one Hydro character on your Yanfei team, it may be best to do instead.
Yanfei's A4 being reliant on a crit hit makes her ideal crit ratio skew toward 3:4 and 3:5 instead of the standard 1:2.