Comparison between japanese Sensei and japaneseLS apps

http://www.macworld.com/appguide/app.htm...pand=false
Kanji LS touch

Japanese LS touch
http://www.macworld.com/appguide/app.html?id=392812

Japanese Sensei
http://www.macworld.com/appguide/app.html?id=361086

They all have gotten good reviews and cost between 11 and 16 dollars