I like the umi better. The Accusteer gets loose fairly quickly and has to be tighened. Accusteer is also kinda low for my taste, ya you can get raised bars, but for some reason I dont really like it that much. Umi also has replacement parts, and is fairly easy to rebuild once you get it down. My UMI has quickturn, as does the accusteer.
You can see below for comparison, the 95 (green ski) has Accusteer and the 93 has the UMI. Umi is slightly higher and more comfortable for me. (I'm 6')