The problem in working out which one is best is that they are all good. Mamiya, Rolleicord, Rolleiflex, Autocord, Microflex and Yashicamat are all great.
If you are happy with a fixed 'normal' lens then all but the Mamiya will offer you this in a lightweight body. If you want to change lenses then you need to look at the Mamiya range of TLRs. More versatile but also a bit more bulk to carry around.
I have a Rolleicord V in my collection of around thirty film cameras. If I was only allowed to keep one, this would be the one.