if they're giving you a computer, find out exactly the specs of the work machines on offer and compare.
the problems with with mac are mostly related to cost (you're not paying) and the walled garden (you're not planning to install anything non-work related anyway) so just using one for work won't make you an apple fanboy. but maybe they have old macbooks and recent surfaces as the options, and the windows machines are just better - find out if you can.