Question on which to keep for S!YTiki

I currently have 2 S!YTiki's.

One has +Atk - Spd and another has +Def -HP and I am not sure which one to keep because of the Spd Superbane but I am willing to make either of them work but having difficulties thinking which one to invest in the most and which will be merged/foddered. What build suggestions would you guys recommend for either of them? Thanks in advance!