nirvana are better
Solid song writing, but the technical abilities do not compare, not in the least. Nirvana were admitted hacks at their instruments.
Pink Floyd is almost objectively one of the most timeless bands of the last 50 years.
There production was on par with todays, they had a movie, they made the first electronica, they pioneered the concept album, they were the music of more than one generation on both sides of the pond, they were the top selling progressive rock band of all time, the along with rush were one of the few bands to have hits in 7/4 time signature(money), they had one of the most tasteful guitarists in the world, and lyrical themes(thewall anyone?) that most people wouldn't even imagine touching. Most importantly they have very very few flaws relative to other big acts(i.e. led zep stole alot of blues music)