Bitcoin has so much room for growth, the sky is the limit.
Visa is nearly at it's full potential, what can they do different from what they already do? Not much.
From an investor point of view, I will without a doubt choose to have Bitcoin as long term investment.
The only benefit you'll receive from Visa is an established, inclined growth over a very long period of time (assuming the life of the business is infinite as you should when investing)
Bitcoin on the other hand does not have guaranteed growth, but in the very likely chance it will grow, you'll receive a massive return.
Bitcoin does have lots of room to grow and the sky truly is the limit, we are all still early adopters