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I'd suggest translating the "feet" to the traditional Japanese measurement "shaku", which is very nearly the same length and will look better than either of those, in my opinion.
十二尺忍者
And use the older kanji for the numbers
拾弐尺忍者
Since that's not what you asked, the one on the left is better.
Caveat: I don't have Japanese eyes
Are there any Japanese natives who can lend their opinion too?