Knob Creek and Evan Williams Single Barrel strike me as very similar bourbons. They are great value picks in that $30-35 range, but they're both falling in age compared to a few years back, and may be losing a little depth of flavor as a result. I've had Knob Creek a few times over the years, including getting a bottle as a groomsman gift at a friend's wedding, and have always enjoyed it. Even without the age statement, I might still give the edge to Knob Creek because at 50%, it hits higher notes and maintains a strong harmony between its brown sugar, molasses sweetness and its peppery oakiness. The stronger proof also allows the layers beneath, including a nice mellow corn scent, to manifest over time. I'll add a major caveat to this blurb: I had a 2 oz pour of Booker's before this one, which really impacted by ability to taste subtler notes, so take all of the above with a grain of salt.