This depends on whether your method needs hardware cooperation. If it needs hardware cooperation, it may be better to apply for utility model, and the cycle is short and the professional points of technical disclosure writing can be guaranteed. But the protection period is 1 years short.
If there is no hardware cooperation, you can only apply for an invention patent. In this case, the application period will be longer, about 1-2 years, but the protection period will be 2 years.