This study compared the effects of teacher feedback (TF) and online automated feedback (AF) on the quality of revision of English writing. It also examined the strengths and weaknesses of the two types of feedback perceived by English language learners (ELLs) as a foreign language (FL). Sixty-eight Chinese students from two English classes participated the study. The two classes received TF and online AF (Scoring Network) respectively upon completion of their draft essays. While the two classes did not differ on the English writing proficiency, the class receiving TF obtained significantly higher scores on essay revision, indicating the better effect of TF. Students' responses showed that, overall, TF was more positively commented upon because the encouraging words motivated students to revise. In contrast, the students receiving online AF criticized the Scoring Network for their difficulty to comprehend the feedback they were provided. The results suggest that English teachers may consider using TF as a major source of feedback in English writing for ELLs in China.