- If you’re already slicing/exporting your icons as their actual size (instead of a 1:1 artboard) you might want to stick with that approach. Talk to your front-end developer before you make any changes.
- If most of your icons are regularly proportioned (square-shaped), then exporting them inside an artboard makes the most sense. It’s better for consistency, and easier to adjust the sizing so they look better in context with other icons. Read this CSS-Tricks article, it explains everything: https://css-tricks.com/svg-artboard-sizing/