PC or MAC

[Wils4x4]

Hi knowledgeable all.......
As we contemplate moving offshore, the ponderance of PC (constant, memory hungry intrusive updates) vrs Mac (not used before) becomes more poignant.
I am interested in how those who maintain a windows platform offshore, do so without guzzling tons of megabytes (".....you must have this update to work efficiently......"). The primary reason for the PC would be routing/weather file receipt and processing - over satellite (aka IridiumGo). only once in port would terrestrial wifi be enabled for TV streaming web browsing etc.
Appreciate your thoughts.....