This study aims to evaluate the effectiveness of ChatGPT and Google Bard in enhancing communication skills in Business English classes at Ba Ria – Vung Tau University. Using a mixed-methods approach, the research applies the Analytic Hierarchy Process (AHP) to assess chatbots based on naturalness, specialization, engagement, and accessibility. Qualitative data from educator and learner interviews highlight benefits such as increased engagement, personalized feedback, and realistic business simulations, while also noting limitations like cultural inaccuracies and over-reliance on chatbot responses. Quantitative results indicate that most learners gained confidence in business communication after chatbot interactions. Based on these findings, the study advocates for a blended learning approach that integrates chatbot use with traditional instruction, emphasizes human moderation for cultural accuracy, and enhances chatbot feedback mechanisms. The research offers practical insights for educators and curriculum designers to integrate AI chatbots into ESP instruction effectively.