Better to invest a lump sum into the stock market or average out every month?

Let’s say you had 50k, would it be better to invest 50k all at once or like 4k every month? Which is better? And why is it better?

On one hand I’m thinking the sooner you invest the better because it has more time to grow.

On the other, I feel like if you invest more frequently over a longer time, it averages out the losses.