Decide on the style
The best press-on nail sets depend on what nail shape and style you’re going for (i.e., coffin nails, stiletto nails, short nails, long nails, etc.). Most brands offer a wide range of styles, but some have more ~niche~ options, like if you want extra-long press-on nails or short fake nails. Or maybe you prefer a squoval shape or lipstick nails.
But if you’re more into the design than anything, look for press-on nails that you can clip and file to shape exactly how you like. Usually, thin press ons are good for this, but some thicker press ons were made to be shaped. Check the packaging though, as some kits say to avoid filing on the package to reduce chipping.
Consider your adhesive method
If you want your press-on nails to really last, then you should def invest in a kit that comes with glue or purchase a specific nail glue separately. An ultra-sticky glue really adheres your nail to the press on from all angles, which gives the edges something to grip onto and avoid lifting up.
But if longevity isn’t your goal here, then opt for convenience with a set of adhesive tab press-on nails. Legit, you just pull back the tab and stick the fake nail right on. It simply could not get easier. (But, tbh, these usually don’t last super long, unless you combine methods.)