If you are going on taste alone, Beverly KILLS Isopure.
In terms of contents, I think they're both decent, and both close enough to each other that it doesn't make a huge difference. You'll get a few carbs/fat with Beverly, but not enough that I would worry about it.
I think Isopure tastes like ASS personally, but I do use it. I usually mix it or some IDS with a scoop of the Beverly.