Dragon Tiger version is amzingly good, but the KR Storm version is meh and its not as good once we get Hongmoon legendary. IMO I’m most likely going with Hongmoon legendary since NA team announced on their stream we’re not getting the Dragon Tiger (TW) version and we’re getting Storm (KR) version.
If you go Hongmoon legendary path then yes your pirate wep evolves into it later, if you go Naryu Lab legendary then its completely separate from Hongmoon weapon path. You have the Hongmoon legendary at later 50 and the legendary that will come with Naryu Lab, these two are completely different legendary. Depends on which legendary path you want to follow.