I would say these are completely different.
I agree. Visa is a business that will most likely continue to be successful over time. Bitcoin is something that may or may not continue to have value in the future.
Bitcoin is not a stock at all. And investing in Visa is likely not possible unless you are a legally "qualified investor". How do you become a qualified investor? You need to prove that you have a million dollars and that you make a half million per year. That's it.
What are you talking about? You can buy visa stock with any brokerage account. You need to have very little money to be able to invest in visa stock. Less then $100