Each person has different method to learn something and learning speed and proceeding information speed can be vary depending on people's perception ability. Some people prefers to study by just themselves while some prefers to study in a small group. For me, It is really hard to choose which one is better.
First of all, I would like to discuss about individual learning. Individual learning means we can learn without cooperating with the people. Maybe this activity is better for those are not sociable or prefers to study in quiet and calm environment. The less people around us whien we study, the more we can concentrate on certain task.
On the other hand, learning in a group is another method that can have some benefits from it. It seems like people can be more productive during group learning. For example: There will be unknown question, complicated and uneasy tasks while you study and in this case, you can learn from your group mates, then if your group mates face the same situation like yours, you can help them as well. Learning in a group can shape people into better version like helpful, responsible and more open minded.
Generally, It is hard to tell which one is better than another one because both can be effective methods to learn.