My skin tone is so pale and pinky/neutral that I find they often make me look yellow. It took a lot of research and reading up of reviews in order to be satisfied with the small collection I've acquired. I must say, I really love every one of them in a different way.
As you can see from the swatches, they are quite different from each other. I tend to prefer the look of ashier or neutral brown powders on my skin tone such as the Sleek Contour Kit, and NARS Laguna for contouring the cheekbones. Laguna is my only contour/bronzing powder with significant shimmer but as stated by many bloggers before me, this shimmer is actually quite subtle on the skin, and does not interfere with its function as a contour powder. If not blended properly, especially since it is so pigmented, NYX Taupe can look dirty on my skin tone. I really like it for a night out because it gives a realistic and quite deep looking shadow to the hollows of my cheekbones - however, I don't think I'd use this everyday other than with an extremely light hand. I use the Diorskin Nude Tan Powder to create an overall glow (as it does contain a bit of light shimmer), rather than a specific contour. It's excellent for that purpose since it isn't too pigmented, and blends wonderfully into foundation. MAC Harmony works very well as a contour powder, or as a blush. It is a bit pinker than most of my contour shades, but I find this works especially well if used to contour without any blush to my face - it adds a bit of healthy color to it. Illamaqua Disobey tends to lean more yellow and is more suitable for my skin tone in the summer - the softness of this powder is amazing, and incredibly easy to blend. It's also a great color to blend in the eye socket to soften the edges of a dark eye makeup look.
Hope this comparison was somewhat helpful for you! Bronzers and contour powders are tricky - not every bronzer/contour shade will suit every coloring! The best thing to do is to test them out before purchasing - and don't be afraid to return something if it doesn't work for you!
What are your favorite bronzers/contour colors? I'm curious to know what works for you!