Though I have not owned the Molinari glove, I can give my two cents why the Kamui glove is better.
1. The Kamui glove has more colour selections (Black, red and blue). Molinari only has two (Black and black cyan).
2. The Kamui glove has 3 sizes for you to choose from (S/M/L) as opposed Molinari glove that only has one size (one size fits all).
3. The Kamui glove is more easily purchasable, you can find it at most major billiard related stores and they should have it. The Molinari glove however is not that common and can only be purchased from two sites, and these two sites are from Europe.
Other than these differences, the gloves are made exactly the same and Molinari gloves are $10 cheaper.
*Fun fact, the Molinari glove has already been seen being used by professionals in the World Cup of Pool, most notably Alex Montpellier from team France. I have yet seen the Kamui glove used by a professional in any of the major events held this year.
*The Molinari glove was released before the Kamui glove.