Is it better to buy Ethereum or Ethereum 2?

Could you please elaborate on the pros and cons of investing in Ethereum versus Ethereum 2? I'm particularly interested in understanding the differences between the two and which one offers a more favorable return on investment. Also, could you explain the staking process involved in Ethereum 2 and how it impacts the overall investment decision? Finally, considering the volatility of the cryptocurrency market, how should investors approach this decision, and what factors should they take into account?