There might be a privacy argument for staying with one company, but in many cases other techniques (as just a few examples: encrypting files locally into archive folders before uploading to backup clouds, cookie clearing, adobe flash blocking, VPNs, keeping well away from having IoT devices in your home/office ...) will give a greater improvement to privacy than sticking with one company will (as one company might still sell to many users of data). You might even argue that sticking with ne company for everything lets them get a full pucture while working across several for different things lets each only see a single side of your life, I'd like to see proper quantitative arguments over whether this or having everything with one company is better but doubt the necessary info can be easily found to make a determination either way.
Aside from privacy though, sticking with one company can make things more severe if something goes wrong, if you're with multiple independent companies for different products then if one of the companies closes down, or has some sevre tempoaray problems with their services, atleast not everything you're trying to use will be affected.
My personal advice would be to use whichever things you need (for example: some programs you may need to run might well force your choice of OS, you might have to use a certain browser if you want to use certain features and compatibilities...) but where possible pick open source products when you can. They won't be harvesting your data to sell, or harvesting it for governments either. They'll be aware sooner and patch quicker when a software vulnerability is found. If they make interface changes which are unpopular the old version will often stick around, it might even be forked into a new arm of development and continue being security/bugfix updated in parallel to the newer version. They'll be free as in beer, as well as free as in speech. If you do come across a bug that is new and undocumented they'll probably be more interested in hearing about it and fixing it for the next version than a lot of commercial products.
Edited by rp88, 31 July 2017 - 05:10 PM.
Back on this site, for a while anyway, been so busy the last year.
My systems:2 laptops, intel i3 processors, windows 8.1 installed on the hard-drive and linux mint 17.3 MATE installed to USB