The choice is totally yours. If you prefer solo travel then it’s only you and yourself more. You travel at your own pace. In group travel you are likely to meet like minded people, likely to be in a group that might allow you to form life long friendships. I have done group travel only so far, though my preference would always be solo travel for I feel I could experience the full essence of travel.
Solo travel -
You have the freedom to make your own decisions. Doing whatever your heart desires is liberating. Travelling alone can often be risky and especially if you are travelling to a foreign country.
The way you use your freedom and spend your time and money is completely up to you.
Being on your own on the road will help you gain more valuable skills and makes you a more confident person.
group travel -
You'll meet new people While traveling, it's not always easy to make lasting connections.
group travel offers you safety and immediate help. But here you have to make sacrifices and compromise. Traveling in a group is more fun. You don't have to focus as much on safety or getting around, so you can relax and enjoy yourself more fully.