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There may even be disagreements even on food and accommodation traveling
Another interesting point relates to communication. Its easier to meet people alone! And there are not only meetings of couchsurfers (and sometimes overnight stops - its also easier to find accommodation for the night alone). I also met locals in different places; even just while walking, they often came up and started chatting. And if you can still agree on routes, pastime, accommodation and food and find points of contact, then in the matter of communication with locals or other travelers, traveling around the world alone is much more interesting - because with a couple or, moreover, with a large company a local is less likely to be approached than a single person.