No they don't. Fallout 3's art design is far superior.
"Allow me to make a totally illogical statement that claims one game has superior art design to the other even though they utilize the EXACT SAME VISUAL RESOURCES and offer absolutely no evidence whatsoever to back up my statement."
Or...
Desert wasteland + green tint = amazing 10/10 art design
Desert wasteland + orange tint = horrible 0/10 terrible art design