Board Thread:Questions and Answers/@comment-26422643-20150522041805/@comment-26215551-20150522084227

At the same levels, Tachis will generally perform better than Uchis and Wakis, so in general it would be a good investment to raise your Ichigo and Shokudaikiri. You'll especially feel the different in World 5.

Like Oredare said, I'd recommend trying to battle KBC as much as possible the next couple of days to get Urashima and Nagasone while the 10x Campaign is still going on. You can always grind 5-3 and 5-4 anytime later. Even during this campaign, the chances of getting them are probably 5% or less, so you can imagine how hard they'd be to get outside of the campaign. I'd recommend Lv10~29 KBC since they are especially easy to beat if you have good swords in their late 20s.