I actually rarely shop at Uniqlo unless I'm getting something like underwear or socks. The style is better than Old Navy but I wouldn't say that much better.

Usually I go through Harajuku (excluding Takeshita-dori), Shibuya, Omotesando, and Shinjuku and go through the various stores. Especially in Harajuku stores tend to close constantly and are replaced, but theres always something good to find.