It would be my opinion that it would less difficult to succeed as an investor. My conclusion is based on the ability for the investor to diversify, thereby reducing their risk.
However, the ultimate answer depends largely on what you start with and how you define success. For example, if you have funds which can be invested, becoming a successful investor is significantly easier then if you do not and must spend years developing an investment foundation. Under this scenario, it may be less difficult to succeed as an entrepreneur.
It should be noted that even with the appropriate knowledge base and experience, obtaining success at either is generally difficult.
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