I am familiar with the hard stats of most of the breeds, but I don’t have the interraction with all of them to to give you an educated answer. One breed may be my favorite guard dog, while another would be my favorite cuddle monster.
By far, the best dog I ever had was Fritz, a shih-tzu. We were almost extensions of each other, we were so close. He was very smart, something shih-tzus are not known for. I trianed him to do all kinds of things (for safety reasons, and so that he would be accepted in all social situations), and I honestly believe that the only reason he learned them was because he loved me. I loved that dog with all my heart and still miss him to this day.
He went everywhere I went. He rafted down rivers, canoed on lakes, went to different beaches (he loved chasing seagulls), traveled to different states, and to every outdoor restaurant in the Atlanta area. As hard as I have tried, I have never been able to replace him. I consider it a privelege that I was able to spend my life with him for 16 years.