I would travel with close family if I was traveling without a group, as family holidays are for family. Some of my fondest memories are on holiday with my family, as you know family and they know you. I prefer traveling without a group as it dilutes the holiday experience as I prefer for my family holidays to just be with family.
However, if I was going to travel with a group, I would prefer to travel alone than with friends. While being alone on a bustling street can be a bit unnerving, I find that I quickly overcome that feeling. I prefer to make friends inside the group, even if it's just for the week. Many of my friends have found true love while traveling, and I hope I will find some soon too! Even if I don't find love, you can find a good friend in a group, although finding friends on a trip isn't really for everyone.