I'll choose to get an investor because I don't yet have experience running a profitable business with positive cash flow. By finding an investor, I must prepare a pitch deck, which forces me to continuously improve and verify my ideas. I also learn how to convince investors. This is a very good experience. So, besides getting a cash injection , I can learn more about the potential of my ideas because I need to convince investors by answering their concerns.
I have not seen where loan is giving in a favorable condition, but if you are getting a loan from someone who is God fearing with interest rate and conditions looks cool, you will enjoy loan as well but as I said, the loan interest rate and other conditions has to be favorable. Have you look at it in a way that you have a place you will have interest rate less than 10% with long term payback, you will run that business with rest of mind and wouldn't mind the zigzag movement that may come later, your aim is to succeed.
Don't forget that investors are mean people, they might agree to give you money but it comes with a cost, they may ask you to give them some of the business equity before they can loan you money whether a cash flow or fixed cash. You will be the one to run the business and you must succeed but after everything, they take their own percentage at the end of the day. Nothing is easy when it comes to running a business buddy.