As always I enjoyed the in depth approach you take when approaching a question. I dont really have a prefrence, for me it's more a matter of fitting the lens to the application. In studio I don't need fast glass as my aperture rarely drops below f/5.6. With sufficient floor space and FOV I can routinely shoot head and shoulders kids and adults at 105mm. When I get into the more elaborate "set" shots 50mm is my go to. Using a technique I learned from a Joel Grimes video, I'll sometimes use the perspective distortion of a 28mm to "enlarge" the arms, muscle on men. In studio bokeh isnt so much a concern, but sharpness is. Outside, it depends on the application, if I'm shooting ambient the legacy f/1.8 135mm is a good choice because of its buttery OOF and smooth transition between zones, as are the FA 100m 2.8, the 77mm f/1.8, LTD, and the legacy 50mm f/1.2. Many times it comes down to a choice based on FOV and space between the subject/subjects.