Takara Arcee is way better in my opinion, the black on the Hasbro version does the toy no favours, and the paint aps on the Takara versions face, while being a bit silly capture the G1 Arcee look.
Chromia probably has a nicer shade of blue on the Hasbro version, however the Japanese versions almost always have better executed paint jobs, so for me the Legends versions are the clear winners.