For the most part, the answer to this will be a personal one.  Some people like the look of Blinds, some like Shades. It’s a matter of personal preference.

But many times function plays a role in which covering is better for a particular window.  Blinds are a preferred method of adjusting light, as there are dozens of options in the degree of tilt and lift.  Shades don’t tilt but are typically better insulators.  Also, because they come in various fabrics and opacities, from sheer to blackout, they can be a better when only one is prefered.