Well, I have my (Scarlet) Ninjini on the Swords of Might path and it makes her really powerful. The other path looks fun, though. I guess you may have to choose between being powerful or being fun.
I totally agree with you, Buuzer. That's exactly what I chose for Scarlet Ninjini and Mini-Jini. The Swords of Might path is good, but I enjoy Ancient Djinn Magic way more.