Any feedback on Designer protein powder versus Isopure Zero Carb?

I'm six months post-op and have been using the Designer protein in chocolate from GNC because it is the only one that I have tried that it not so sickeningly sweet. However, when looking around GNC today, I spotted Isopure Zero Carb powder and I note it appears to be far more economical than the Designer brand. Anybody tried the two of these? How do they compare in terms of taste, sweetness, consistency, etc? Thanks very much.

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