I don't know any "best trailer." I can contrive situations where virtually any trailer would be the "best trailer."

For me and my needs, the BAW 64A is the best trailer. However, it is a heavy-duty cargo trailer. It is relatively heavy and I would not want to tour with it. If I wanted a trailer for touring, I would consider the BOB. I would also consider a BOB if my only trailer needs were under 60 lbs (ie, grocery runs). I would consider a Burley or similar child trailer if I wanted to take a small child or pet (dog, cat) on tour or drag a child around on fitness rides in inclement weather.