These plants are thought to be very similar. In fact some believe they are synonymous. I am growing both and have been observing them for myself. I grow 2 'Aka omote' both are 4-5 yr grafts and one 'Ruby' which is a 2nd year graft. In the photos we can see that the leaf shapes, at this point, are quite different (more/less orbicular) in a somewhat subtle way. I don't draw conclusions about the red shading in either plant because the sun exposure is slightly different and both plants seem to bronze up rapidly when moved into an exposed location. Also the new growth shown in the photos results from a super rainy month or so here in Philly. All plants are in pots and have had a dose of nutricote. I communicated with Norm Jacobs at Arbutus Garden Arts, a retailer of 'Ruby'. Norm passed along this info: Ruby/Jim's Red has almost exactly the same size/shape of leaf as Aka Omote, but the plants are different in the color-cycle of their leaves, and even more different in their cultural needs. Aka Omote's leaves open like a parasol, while Ruby's open in a more conventional form - Aka Omote begins maroon and keeps that blush until the heat of summer, then puts on a vibrant red and yellow display in the fall. Ruby opens deeper black/red and evolves toward a brighter red, only bronzing in July or later. It has less brilliant fall color than Aka Omote. Culturally, Aka Omote performs best in a more shady situation - morning sun, then shelter for the rest of the day. It will burn in full sun. Ruby can be grown in full sun. Both do best with average moisture - possibly owing to some A. shirasawanum in their genes. While neither is fast growing, Ruby is the more vigorous. The original seedling is about eight feet tall and wide in about 20 years. Jim is Jim Schmidt of Canby, Oregon. I'm interested in anyone's thoughts and observations. 'Aka omote' is a favorite of mine and it could be that 'Ruby' too is choice.