Macs have dominated in the areas I have worked in for the past 6 years. I would say in the companies, hands-on meetups and conferences I been to in London and across Scandinavia: 75% use macbooks, then perhaps 15% dell xps with ubuntu and 10% mix of lenovo, MS surface etc.
Though I think this split will change with the recoil of the new touch bar macs.
(Again this is just from my smaller demographic of location and people.)