I've toured with groups, a friend or two, and alone.

All are OK, though different. IMO 3 people is ideal, and platooning allows more of a cushion when you run into bad luck, ie. multiple flats. It's also nice to divide the load o stuff that's shareable, ie stove and cookware, along with some of the end of day and break camp chores.

But, I'm comfortable touring alone, though I generally don't camp when alone, except for the odd night in a tube tent or whatever, without stove.

One nice thing about touring alone, is that it's sometimes easier to get into conversations with people along the way. Strangers see two or three people together, they don't like to intrude, but one guy alone they figure they can't be interrupting anything.

Of course enjoying touring solo depends on how self contained you are. If you don't enjoy your own company, and aren't confident in your coping skills, it can feel very lonely and exposed, which will grate on you after a while.

Lastly, depending on where you're touring, there's the chance that you'll run into others, and maybe join them for a while, without the commitment that starting with someone would involve.