Ba Jin and Jiu Wang Mu are well-known men's wear brands, and their quality is guaranteed. However, to directly compare which brand has better quality, we need to consider the following factors:

1. Material quality: Ba Jin and Jiu Wangmu use different materials when making clothes, such as fabrics and accessories, which may affect the quality of clothes.

2. Production technology: Different brands may have differences in production technology, which will also affect the quality of clothing.

3. Rationality of design: The design concept of the brand and the style and tailoring of the clothing will also affect the sense of wearing and durability.

4. Market demand and word of mouth: brand awareness, market demand and word of mouth are also important factors affecting quality.

To sum up, judging which brand has better quality needs to be evaluated according to the specific situation. It is suggested that you pay more attention to the material, production technology, design rationality and other information of the product when purchasing, and refer to the evaluation and feedback of other consumers to make a more informed purchase decision.