More places use Suse than you might think.
We have a suse office over here in seattle and they campaign to some of the local companies.
I also run into ubuntu all the time, although I am seeing more and more companies switching away from ubuntu and going back to something like red hat or debian.
I actually ran into 2 companies not too long ago that were using fedora believe it or not. And not some ancient version either. One was on fedora 25 and the other was on fedora 26.