I would highly recommend completely ignoring scalability for your MVP. Choose tech you enjoy writing/learning. Right now you don't have enough info to make a

I would highly recommend completely ignoring scalability for your MVP. Choose tech you enjoy writing/learning. Right now you don't have enough info to make a good performance decision, so you might as well choose a stack that will encourage you to complete the project. As you learn more about the task, you will be able to decide what kind of tech makes the most sense.