It depends on the use case. I find Inferno/Viridis perfectly good for representing one-dimensional gradients. They're easier to glance at then a single hue and

It depends on the use case. I find Inferno/Viridis perfectly good for representing one-dimensional gradients. They're easier to glance at then a single hue and show contrast between min/max better. Greyscale and single hue can also make it hard to notice small variations. I can see Turbo being useful for heatmaps where you want to notice differences rather than variation between hot and cold. In general though I would say that choice of colormap is subjective and there isn't a general rule for when to use which colormap. I usually plot the same image in multiple colormaps and choose the one which helps me the most for that usecase. Another person may choose differently.