I like RBO, too. It's mild and helps to soften the skin. Although, I should mention I primarily use it in scrubs and lotions. I've read that it's a good substitute for OO in soaps.
Ihave never used the Soy but did add a little ricebran to mysoaps a few years backwhen I found it on special at somehting like 12.00 for four litres............Bargain :0) it was fine but I did notice that my recipe tended to trace that little bit quicker