Sprawl wins hands down and here is why. I bought both the Sprawl Rash Guard long sleeve shirt and the Under Armour HeatGear compression long sleeve shirt for Brazilian Jiu-Jitsu. I found that the Under Armor shirt was thin and tended to ride up. Because it is a compression top it just stayed up. I also felt like a sausage. Whats worse is when I was in a crunch or being smothered having any constriction around my chest didn’t help. I didn’t notice that much change when it came to “moisture transport” as I wear a heavy cotton gi. Also the “bolstering of muscle support” didn’t seem to matter. It did provide good abrasion-resistant. That was its one redeeming quality. Sprawl Rash Guard was thicker and I feel would last longer especially with its double stitching. It has a loose fit and falls down if it gets pushed or rolled up. It has a very pleasant silky feeling and doesn’t compress your already struggling lungs in a good match. It provide the same level of abrasion-resistant as the Under Armour did. I knew I’d be staying with the Sprawl Rash Guard when I realized it hadn’t been washed from my last practice and I would have to wear the Under Armour HeatGear shirt. Sprawl’s Rash Guard taps out Under Armour which really was never made for Brazilian Jiu-Jitsu.