I can recall, it's been a while since I've ordered from AllTheWhey, but there seemed to be a heavy preference of one over the other. I bought the blend last time, tastes pretty good, but I knew at the time I was buying the cheaper, inferior product (was low on cash).

So...which one was it? Help!

Isolate is the more expensive, more refined protein. Concentrate is cheaper, but has a lower percentage of protein.