Radennotachi at its final stage atm is not quite as good as a hagun but when the new update comes there will probably be more trials to make it better then hagun. for that reason im workin on raden right now. At the bird in Misreaux... gunna be fun.
Kurodachi is also worth looking into. Its basically a higher dmg soboro
Id say it depends what u do which is better. if you party or do endgame alot use a raden if you solo use the kurodachi. Just my opinion anyway