How many varieties of Lagerstroemia speciosa are there? What are the characteristics of each variety? Which variety is good?

Lagerstroemia speciosa is similar to Lagerstroemia speciosa in America. Japanese Lagerstroemia speciosa grows faster, the color of Japanese Lagerstroemia speciosa is purplish red, American Lagerstroemia speciosa is reddish, and its leaves are red. I think purple can highlight the characteristics and conform to the meaning of Lagerstroemia speciosa, but red flowers and red leaves are rather monotonous and vulgar. I think Japanese Lagerstroemia speciosa is better.