In my opinion i would use rusto for outlines and krylon for fills...i only say that is cause i only use the chrome krylons...but it kinda just varies on the color like rustos magenta color sprays awesome but there citrus green is real watery, i only use rusto for fills (they have more colors than krylon) and what not and i try to use a ironlak can for outlines
Lmao AT ALL THE KRYLON IS ASS comments. I did a throwup with 2 cans of krylon it was black n white and the fill was so dusty i was embarassed when i went to see it rock the next day i was praying for a buff.
Some of the new Krylon Fusions are actually not too bad for fills, they also have the male valve that works with ur adapters (Not as thick at the top). Stay away from regular Krylon formula if you can tho, ultra shitty coverage. My budget setup is Rusto for fills and some Ironlak for lines.
I have not had good experience with any Krylon paints, like SAL74 said, the coverage is shit. I find that rusto is generally good, but I do find that some colors are nicer than others. Ideally, you should try both and compare for yourself.