If you are just wanting a drop shadow that you’ll never be animating, it doesn’t matter which of the two approaches you go with. You’ll be a winner with both
box-shadow and the drop-shadow
filter. If you are going to be animating any part of your shadow like its position, size, or color, then you should go the filter route!
There are a few more general animation-related techniques we’ll need to keep in mind, so if you want to learn more about animating drop shadows beyond the brief overview we saw here, do check out the Animating Drop Shadows
article and/or video
for the full burrito buffet! 🌯