I think it depends on your head shape and hair texture. For example, on mine I always get a 2 on the back and sides, but keep it longer on top (about 1.5-2 inches). This haircut helps me pass 80-100% of the time. However, I also have straight, thick hair that works with the way I style it, and my head shape is longer, more oval, and less puffy. Some FtM's/masculine presenting folk have head shapes that are round or more baby-ish, in which case the haircut that helps me pass might not help them. They might need bangs or a longer length that works with the roundness, rather than highlighting it. Also, keep in mind if you have curly/thin hair, and maybe google haircuts and styles that work with that hair texture.