I have experience with the Castelli YPro3's, both the bibs & the shorts, & the Louis Garneau power shorts. The chamois have some similarities & some differences. They are a fairly stiff chamois in both brands. The LG chamois is thicker & seamless. The Castelli chamois has seams, which bother me at times. The inseams on the Castellis are much shorter than the LG Power. The fit on the 2 brands is very different. Castelli is made for a taller rider, at 5'2" they are kind of big on me. The straps are too long on the bibs, but the fabric molds around the waist well so they stay up that way. They still feel a little baggy around the butt, even with a size small, which is a size smaller than their size chart recommends. The LG Power shorts have great fit, and lots of panels that mold to the body well. They are one of my favorites right now.