Please write new answer, in own words.

Nikola's stock began trading on June 4, 2020. As of Dec 17, 2020, Nikola stock price have made 0.1049% expected daily return with 5.884% standard deviation, while Tesla stock price have made 0.1853% expected daily return with 3.533% standard deviation. The correlation coefficient of those stock is -0.7718, which is extraordinarily opposite. Which stock would you suggest to invest? Why? Provide an investment strategy based on the statistics and portfolio investment theory.