Choosing your distribution
Surprisingly, picking which distribution, or distro as it is commonly called in the Linux world, can be far more of a challenge than it seems like it should be. You might be lucky and work for a company that has a pre-determined Linux distro standard that you have to follow, and this question is already answered for you. This is becoming an increasingly rare scenario, though, as companies begin to realize the benefits of using the right distro for the right use case, and as it becomes better known that the idea that skills standardization just doesn't benefit from keeping systems identical as much as it was commonly assumed. But the practice still exists.
At the end of the day, it is essentially nonsensical to lead with operating system over workload choices. There is relatively little value in forcing a specific operating system choice and making application choices based on that. Of course, in an ideal world, all factors are considered and weighed...