A personal observation. It's not a final judgement on what's right or best. In the end it's all down to personal preference.
I find taking pictures thru the viewfinder yield better pics. Especially in composition
Wasn't quite able to figure put why for a while but I think its because of a few factors:
1. The VF focuses your entire view on the pic to be taken, means less distractions.
2. I have a natural tendency to adjust the camera height, less so in LV.
3. The overlaid data in LV blocks some of the pic and being at the periphery tends to hold clutter. Also, in LV the mind sets the perimeter at the inside edge of the data overlay.
4. My mixed myopia n longsight prevents good confirmation of focus using the LV screen. VF diopter adjustment allows for this.
Of course these can be overcome with higher awareness of the issues but VF seems to make it easier
Again, just my thoughts.