I’ve enjoyed making the displays I’ve needed. I’ve used lots of LED types, from one or 2 status LED’s to bar graphs and 7 segment LED’s.
They’re great for clocks or thermometers or volt/ammeters or anything really.
While LCD’s are great at scrolling output and displaying a number of text or number parameters.
It’s even possible to make a composite output from a microcontroller using only 2 resistors. Hook this up to a large LCD or an old CRT and you have a great retro display.
Which ever display I use I try to choose an interface with the lowest pincount possible. The software library also needs to be as easy to use as is practicable.