Robuta

https://gs.statcounter.com/platform-market-share/desktop-mobile-tablet
This graph shows the market share of desktop, mobile & tablet worldwide based on over 5 billion monthly page views.
desktop mobiletablet comparisonmarket shareglobal statsworldwide
https://www.computerweekly.com/photostory/2240221085/Can-Microsoft-make-Surface-Pro-3-the-best-tablet-for-BYOD/5/Surface-Pro-2-an-enterrprise-comaprision
Apart from a few well defined niches, for the majority of users Macs and PCs are more-or-less interchangeable.
surface proenterprise comparisonmicrosoftmake