Traveling is a very personal and stylistic activity, created to offer the most pleasing and rewarding experience for the traveler. Every person is unique, thus the idyllic travel experience is individualized.
I have traveled alone as many times as I have traveled with friends and family. I enjoy traveling with others, but not as much as I love traveling alone. When you travel alone, the possibilities are endless. You can change the course or altar the destination. You can stay one night at a fancy-schmancy hotel, and the next camping at KOA.
Traveling with a group requires a lot more compromise. You may have dreamed of going to the Museum of Natural History, while your travel mates dreamed of hanging at a local dive bar all afternoon.
I recently traveled to Redland, Florida with my brother. I love him dearly, but enthusiastic input is not his strong suit. Every idea I came up with, either went unheard, or "Sure, that sounds fine." Now, you're probably thinking what is wrong with someone going with the flow? Not what bothered me. What bothered me was, having a person to travel with, who didn't really seem to enjoy the journey as much as I did, or didn't express it.
I still had a lot of fun, it just took work, which isn't required when adventuring on your own. The bonuses of traveling with someone, the experience is shared (and hopefully celebrated), you don't have to take endless selfies or landscape shots, the cost is usually cheaper, and it's safer.
Even with all of these great reasons to travel with mates, I still prefer the explorer's quest of the unknown, which is very uncomfortable for many people. Most want to have a well thought out plan, and this is the reason behind my love of solo traveling. No plan. Just adventure travel.
So, if a plan and travel mates are your thing, make sure to choose the right people. Picking the right people to travel with, is just as important as where you are going. And if you want to see anything and everything without worrying about it, go solo.