Rice milk has a thinner consistency than soy, and seems watery to me in coffeee. When I want to use a *creamer* in my coffee or tea, I use soy. Almond milk is nice too, but it gives coffee an almond flavored taste - nice from time to time, but I generally prefer coffee unflavored.
Chocolate soy milk, heated, makes a hot chocolate that, IMO, is superior to dairy hot chocolate. My ex, a big dairy milk drinker, thinks that chocolate soy is better than chocolate dairy milk. I buy my chocolate soy milk from Aldi's - their house brand - as good as Silk, and cheaper.