Both are very interesting. Ultimately, I love to travel with others, especially if I am sharing some neat spot with them. But it has its disadvantages. For instance, you are only as fast as the slowest person, and that can be pretty slow, at times. A lot of people are not great travelers. Perhaps, it is their first time abroad, or they are disorganized, or they just don't care about going to a temple, or ruins, or landmark. That can mean things take a lot longer to get done and your time is limited. Traveling alone means you do as much as you want, and when you are motivated, that means a lot of extra sightseeing or experiences.