I just compared the Nutrition Labels of Shakeology (chocolate) and Spiru-tein (chocolate).....Spiru-tein is much cheaper per serving, uses non GMO soy along with rice and pea protein, and provides essential nutrients lacking in Shakeology, notably Niacin, Biotin, and Vitamins D and E. However, Shakeology offers a much more diverse collection of nutrients, notably Vitamins C, B1, B2, B3, B6 and B12, as well as a variety of super-foods. As ingredients go I'd say that Shakeology wins out with huge array of plant based nutrients, apparently no soy, and added probiotics. Spiru-tein has a much lower cost and provides great nutrition, importantly many not in Shakeology.
There is a lot of overlap, they both provide quality nutrition with protein, and a wealth of nutrients that most meal replacement drinks can't match. They both taste great!
In the end, I recommend including them both as quick, easy, quality, calories. Fast food for the health-nut. Ideally we would all have time and money to buy and prepare only raw organic meals. We can try, but these supplements make it easier to be healthy.
I also recommend investing in a high quality juicer.
You can get Shakeology through me or your Beachbody Coach, and Spiru-tien from your local natural health food store ( around here: Wynant's, Friendly Street Market, and probably available at Capella's and Sundance)