I'd recommend Hmong RPA as a pinyin type replacement, and Hmong Paj Ntaub as the one to represent our people. Why? It's original and looks very Hmoob.
Hmoob RPA uses Western characters.
Hmoob Pahawh uses Lao/Thai looking characters.
Does not represent Hmong/Miao whatsoever. This belief or idea is actually false and a misrepresentat
ion of what is genuine or factual. If you or anyone were to compare ALL of the supposed symbols/signs in the "Paj Ntaub Script" to actual and authentic Hmong/Miao embroideries worldwide, you'd see a HUGE discrepancy. Some of the symbols/signs DO NOT even exist in the embroideries. And the bulk of the symbols/signs are either variants, pieces of a whole, or simply manipulated in varies ways and directions, to try and represent scripts, like Chinese characters. Again, this script is purely fabricated. Most importantly, there is absolutely "NO" scholarships, folklore, or any shred of evidence anywhere to support an ancient or lost Hmong Script embedded, hidden, or preserved in Hmong embroidery whatsoever. If there are, they are purely fabricated fairy tales, mainly to try and validate the "Paj Ntaub Script" which Hmong as a whole and in general know it is just not so -- purely false. That much is fact. All and any other argument is pure denial of what is the truth. That is my honest opinion, and the truth, found in Hmong history, folklore, and scholarships past, present, and likely the future as well.
As a matter of fact, an elderly Hmong lady, who was interviewed solely about Hmong embroidery said it best, "In the old days, or pre-Western influences/civilization, the elders etc. were so illiterate that they basically just took signs and symbols from nature to be used in Hmong embroidery." If this does not answer the question over the "Paj Ntaub Script" then clearly anyone who believes in it must be truly gullible, naïve, and ill-informed.
There are plenty of other insightful and academic truths that can be cited in opposition of the "Paj Ntaub Script", but what's the point. Ignorant and uneducated individuals will believe anything.