General Dualblade

Fafnir katara or Japanese Katara for transposing I been debating to myself which one would be better overall for transposing. Seeing as many people say japanese katara, I bought one (like 5mil) and noticed that it has lower attack than fafnir katara (11), and wondered if it was even worth the extra slot as even with primes, it will still be 1 attack below (still haven't looked at how much this would affect enhancements). I also have noticed that fafnir katara has 12 more luk than the japanese katara. I also noticed that you can't psok the japanese katara while you can with the fafnir, which I'm unsure if the japanese katara will be tradable once after transposing it if you never wore it. So this actually made me wondering, is the japanese k