I've done a lot of reading over the past 6 years on nutrition and never really heard those 2 come up as top choices. I generally avoid wheat based flour and grains if I can, especially plain old wheat flour pasta. Spelt and buckwheat are better choices, though maybe not for a smoothie. I'd rather have the raw almonds and coconut, which I usually eat daily with a snack along with dried figs. I've tried almond milk and found it generally tasteless and with little protein...they must not used many almonds in it...lol.
Flax meal is another ingredient that might work in a smoothie. I add pea protein to my breakfast cereal of cooked groats/flax meal/almonds. It's not perfect by any means. I prefer that to whey which often comes with all the negatives of cow's milk. For me pea protein replaced the wheat germ which I cut out. Avocado is another ingredient for a smoothie, though an odd one, and not that cheap. Once flours are pulverized and processed down to that level, a lot of the "goodness" is gone.
Buckwheat is technically a fruit seed, similar to how quinoa is also a fruit and not a grain. I liked to use both of those.