Considering the high-end running tights market is flooded with options, what are the key differences between the Lululemon Fast and Free and the Nike Power, and which one is worth the investment? Both of these brands have a reputation for producing top-notch gear, but how do their flagship tights compare in terms of compression, flexibility, and overall performance? The Lululemon Fast and Free tights boast a four-way stretch and a gusseted crotch for added flexibility, but do these features translate to real-world performance gains? On the other hand, the Nike Power tights utilize a more aggressive compression pattern, which may be beneficial for high-intensity interval training, but could be overkill for longer, more casual runs. How do these different design approaches impact the overall comfort and functionality of the tights? Are there any notable differences in terms of durability, breathability, or moisture-wicking capabilities? What about sizing and fit - do either of these brands tend to run true to size, or are there any quirks to be aware of? Perhaps most importantly, are the premium price tags of these tights justified by their performance, or are there more affordable alternatives that can deliver similar results?