I am going to have to say I like the YSL version better, mainly because of the heel and platform height. For some reason Steve Madden's version looks kind of awkward, but maybe it's just a big size and photographs funny. Wishful thinking? YSL's goes for $716 on Bluefly whereas Steve Madden's is going for just under $70. They both come in an array of colors.
YSL Natural Canvas 'Tribute' Platform Sandals, $716 Bluefly
Steve Madden 'Daarling' T-Strap in Natural Multi, $69.95 Steve Madden