Ceiling-mount or wall-arm rainfall head?

Ceiling-mount drops water straight down, which the r/HomeImprovement and r/bathrooms threads we read describe as the most authentic 'rain' feel — but it locks your shower position and makes it harder to rinse hair without standing directly under it. Wall-arm rain heads (mounted on a long S-arm) are far easier to retrofit, since they don't require opening the ceiling for a drop ell.