Birthday Luck and Shiro IVs
Thought I'd try my luck on my birthday and bought 140 orbs, within 50 I got Silas +Atk -Def, Shiro +Atk -Res and my girl Ophelia +Atk -Spd. If you've seen my previous Good/Bad Luck posts you'll know the banner already gave me a huge number of 5* in 600 but the focus units had shocking IVs, especially 2 -Atk Ophelia. So a nice birthday present from the gods getting her +Atk.
The question: is +Atk -Res, +Def -Res or +Spd -HP better for Shiro? He'll be built with his base kit and QR.
My units in 650 orbs on this banner: Zelgius, Celica, Linde, Maribelle +Spd -Def, my first Mist, Ryoma, my first Brave Hector +Def -Res, Brave Lucina, 2xShiro, Shigure, 3xSilas, Nina -Spd, Flora +Atk -Spd, 3xOphelia. That's 34 orbs per unit. I think my luck's gone for a very long time. Also got a +Spd -Res Cordelia to finish my merge project.
EDIT: thanks folks, I think I'll go for my +Atk Shiro.
+Atk/-Res for all purpose, but if you just want a wall to stall, then +Def/-Res. I have a +Atk Shiro I use occasionally, and I run his base kit and Vantage. Since his weapon gives +4 atk/def when attacked, Vantage lets him cash in that extra atk early. +Spd if you want to prevent doubles, but given that he's meant to be a wall, doubles shouldn't matter too much.