I have not tried Scivation. I have tried many other kinds, Optimum Nut. Cytosport, NSI, EAS (costco), allthewhey. I personally like the taste and mixability of Cytosport and AlltheWhey the best. The EAS tastes like chalk. ON is good but $$ over ATW.
Wow, I went on a tangent. To sum up, I like ATW pricing, taste, and mixability. Plus they have a good section on the board here and free shipping if you talk to Marc or look at his codes.