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Because both are brewed by big rock and both are called Pilsner, this comparison seemed inevitable. Paired this time with heavy smoke and sitting around the propane fire pit.
Co-op - light hoppy notes, no supporting flavor leaves it feeling a bit flat.
Big Rock. More complex flavor, slight creaminess, well rounded.
When the big rock is on sale. It's the clearly superior beverage, but at full price, I'd be tempted to get the co-op for its excellent value.