YOU SAID:

I have seen both birds and bats, but the former is much better

INTO JAPANESE

私は鳥とコウモリの両方を見たことがありますが、前者の方がはるかに優れています

BACK INTO ENGLISH

I've seen both birds and bats, the former is much better

INTO JAPANESE

私は鳥とコウモリの両方を見てきました、前者ははるかに優れています

BACK INTO ENGLISH

I've seen both birds and bats, the former is much better