ARNOLDS ARNOLDS ARNOLDS FTW.
Nothing can beat their juicy spring chicken and spicy batter. Most famous outlet is located at City Plaza near Paya Lebar MRT. Another outlet (mainly for delivery) is at Pasir Ris Pond.
KFC's batter is too thick and flour-ish, Popeyes is only nice at the Changi Airport outlets. Texas chicken is in between KFC and Popeyes imo.