Warren Buffett VS Economist VS YouTube Investing Gurus

Should you invest like economists or YouTube investing gurus or like great investors?

Economists use complicated methods to calculate the intrinsic value of a stock. For example, they use CAPM, WACC and discounted free cash flow.

YouTube gurus only invest using simple means such as looking at P/E ratios

Warren Buffett and other great investors don't rely on economists but on their own logic and common sense