Continuing on with this line of thought: one big advantage of liquid liner is once it sets, it has some great properties: it tends to last all day, be mostly waterproof, and if it does rub off it doesn’t run like mascara will.

Shadow is much less robust, it won’t last the same way. You’ll want to use a primer beforehand and a setting spray after for it to last. It won’t matter for experimenting, but once you get to a daily routine this will be a must.

Gel and pencil liners will usually land somewhere between the two. Softer and less robust than liquid, and sharper and more robust than shadow. I don’t use either, but my wife uses gels