GamePress
Infantry sword unit that has the best IVs, without considering weapons and skills.
Soleil is the best IMO since she has the highest attack of all the the infatry sword units, and with preffered IV's can have a 38/38 offensive spread with a +spd nature.
if considering only units that has a PRF weapon then I think Karla has the best IVs.
Edit: Forgot to talk about defensive sword units, I think Joshua is the best, he has really balanced stats, having good bulk to take hits while having kinda good spd so he won't get doubled a lot, Hinata is a candidate but he's kinda slow and that HP won't really help if that same HP can go to zero real quick since he will get doubled quite often