In medium format, I actually use TLR most and tend to get more good shots out of a roll. They all have the strong composition possibility on a 6x6 ground glass, whisper quiet leaf shutter, and unassuming waist level finder. I used to own a Yashicamat 124G but never fell in love so sold it; now owns a Rolleiflex 3.5F Planar and Mamiya C330S; and soon will get an Autocord and Rolleicord with Triotar. They just grow on me.
Mamiya C330S probably has the best waist level finder and loupe combo that blocks out any stray light, making it the perfect composition machine for me. I got fantastic portraits out of the 105/3.5D and 180/4.5 Super lenses. I never take it with me on the road or a trip, due to its bulk and weight.
Rolleiflex 3.5F Planar is my ultimate choice if I want to take only one film camera/lens (in addition to digital P&S) with me for an important trip. It balances weight, size, usability, reliability and image quality. It has been to a few continent without any problem, but I do keep it in a padded lunch bag next to me most of the time.