i've toured with a stranger I met on the internet, we went our separate ways after 3 weeks. it was his call, but I was really glad we split, we were not enjoying each others' company.
I've toured with a boyfriend, and we broke up the instant the trip was over.... touring was a relationship accelerator.
I've toured with a friend, and it was great most of the time, but sometimes our different eating/camping styles were a challenge.
I've toured alone and been pretty happy with that, but there are drawbacks to having to make every decision and deal with everything yourself. sometimes it's nice to have help. but you never get stuck on someone else's program, so if there's something not going the way you like there's no one to blame but yourself. i think i like alone the best. i would love to tour with my twin sister some time, that would be perfect. but she's not interested.
i haven't toured a non english speaking country yet - i think i would want a partner for that, or it would be too lonely and too challenging.