Suppose BOTH, really ... ... depending on one's tastes.

Opinions can - as do the locations - vary GREATLY. Some forms of the practice may, of course, be considered aesthetically pleasing to the eye; *others will rightly be deemed offensive eyesores ... especially if *these consist of nothing more than badly~scrawled lettering on public or (worse!) private properties.

Countries abroad that I've visited over the years, have, however, impressed me with their own range of talent on display ... most notably in those whose Capital cities have an Underground/Metro network.

There follows, an appropriate link in which members might be interested:

www.widewalls.ch/is-graffiti-art-or-vandalism/ ...

So feel free to express your opinions.