What is a reasonable ROI?

[Peter O.]

This is my first post here, and I am just starting out, trying to learn, and hoping to make my first purchase, so please be patient if I am asking very basic questions. I just analyzed a property using the Bigger Pockets rental property calculator. I get a CoC ROI of 6.09, and a 5-year annualized return of 15.44. Now, I know that historic stock-market performance is about 7%.

My first question is, which number should I be looking at? Should I be comparing the 7% I will likely get by investing in an index fund versus the 6.09% CoC ROI, or the 15.44% 5-year annualized?

My second question is, are these good numbers? What would you consider to be a minimum return before you buy? After all, any purchase would require a lot of work, both before and after purchase, so I would like to be making more than the stock market to make it worth it.

Thank you in advance for your help.