Its depend on you.
But I prefer, Class Approach because of following reason
Class is pure ES6, module.exports is borrow from common.js
Node.js LTS version v10 recommended to use Pure ES6 and module.exports is deprecated in Node.js v12
Class approach is easy to make inheritance and interface. Because it's same as our traditional OOPS approach, we don't need any prior knowledge of JavaScript "prototype "and "proto "