Landscape vs Portrait

[Tugdual]

I also prefer landscape for reasons already mentioned in this thread.
I use fingers on the desk, not thumbs with calc on palm; when I read "my grand father owned a 15C" I guess OP is a new gen smartphone user.
The calculator fits nicely in between the PC keyboard and the edge of the desk.
I find it easier to look at screen and keyboard because the distance is shorter.

I also own a 50g but I definitely find the 15C more comfortable.