You might see street art that is lovelier more aesthetically pleasing or may make a cursory comment to the culture it is in. A comment on street art or artist. It is almost a language only spoken and understood by the artists themselves.

Banksy's art besides being uniquely his (nearly iconic as it has a cultish following) makes a strong sometimes playful social comment about the wider world that the non street art viewer can connect to. I guess that is why the kissing policemen, and baby on oil barrel and the city worker spray painting over cave art really grab my attention.