Katy's looks really tacky and middle schoolish. Gaga's on the other hand serves high fashion icon.
This. Gaga looks sophisticated and the cover almost looks timeless with its vintage quality.
Katy's is alright but nothing special, plus I really don't like the green hair.
Neither look ugly though.
Gaga has a high fashion professional cover, Katy has a picture that could be a Facebook profile pic on the cover of Rolling Stone, so Lady Gaga has the better cover