For myself I use a short scissors. Narrow two inch blade, about four inches long total. Got them at a Singer store. Liked them so much a week later I bought three more pairs.

Also depends how you manicure your product. If I have a lot to do I will swich to longer bladed. If I am manicuring my personal, out come the short blades.

Try as many pairs as you can. See what each feels like. Eventualy you will find a pair that feels best to you. Then buy more than one. If you are lucky, you will be spending a lot of time behind them.