The answer somewhat depends on what sort of scope you have.
Most of the time I'm trying to learn how to do astrophotography, so none of them except for an illuminated reticle. I've got a brand new LP LER 5mm that hasn't even got out of the box in the three months since I bought it.
That is about the magnification limit for my SCT.
For SWMBO's school nights, mostly a 40mm (51x), 25mm (81x) and a bit of 10mm (203x). And then I watch the laptop - to use the guide camera to put objects back in view as the children bump things, and to set up new targets in CDC or Stellarium.