Both online forums and study groups can be valuable resources for studying commerce, so it really depends on your personal preferences and learning style. Here are some factors to consider:

1. Learning style: Some people prefer individual study and find online forums more beneficial as they allow for self-paced learning and the ability to focus on specific topics of interest. On the other hand, if you learn better through group discussions and interactions, joining a study group might be more suitable.

2. Flexibility: Online forums provide flexibility as you can access them at any time and from anywhere. This can be particularly helpful if you have a busy schedule or if you prefer studying at odd hours. Study groups, on the other hand, usually have fixed meeting times, which may or may not align with your availability.

3. Subject-specific questions: If you have specific questions or doubts related to a particular topic in commerce, online forums can be a great resource as you can post your queries and get answers from experts or other students. Study groups can also help with subject-specific questions, but the availability of expertise may vary depending on the members' knowledge.

4. Networking and socializing: Joining a study group allows you to connect with fellow students who are studying the same subject. This can create a supportive environment for learning, where you can share ideas, discuss concepts, and motivate each other. Online forums can also provide a sense of community, but the interactions may be more limited and impersonal.

In conclusion, it may be beneficial to combine both online forums and study groups to enhance your learning experience in commerce. Use online forums for specific questions and to access a wider range of resources, while joining a study group can provide social support and additional perspectives on the subject matter.