First of all i want to clear one thing. Windows 7 IS slower than 8. But 8 is shullbit(well, atleast for me)<and Windows 10 is clearly slower then Windows 7 and 8 altogether. 1.ACTUAL COMPARISON. Fun facts: i`m not an Linux fanboy,i never used Mac OS/X much,.Mostly i will compare Windows (10) and Linux. (Ubuntu, Lubuntu, Zorin and some others.) 1.1.1. Why Windows 10 is comlete crapgarage in comparison to 7,8,XP . First of all,Microsoft knows everything you in Windows 10. EVERYTHING. And saying "I`m not an hacktivist or drugdealer,i have nothing to hide!" is SO COMPLETELY STUPID. If microsoft tells CIA that you use Tor Browser,CIA will get you try to leave your info confidential AKA you fight with the system AKA you are hactivist and potentially dangerous. 1.1.2. Windows 10 is slow. It`s not a secret that if every move is sending to Microsoft`s server,PC will run slower. Oh and yeah,be ready for horrible ping if you will say "I`m planting the bomb" in CS,because you are now spied by 10 CIA servers,FROM YOU OWN OS. 1.1.3. Horrible bugs. All that horrible Windows 7 and 8 bugs with updates ,netsvc,and other stuff is now x5 in Windows 10. 1.1.4.No Windows 11 There won`t be anything for Windows 10 like Windows 7 for Vista,because Windows 10 life span is unlimited,it will bbe updated forever with no changes! 1.1.5. Ha,now Microsoft can block your winodws. Title of this part tells everything you need to know. And that`s not everything. Now your Windows 10 license is linked to your Microsoft account,where you most probably left your e-mail there. Get ready for Egyptian Princes(From Microsoft) to write to you.(and possibly wanting to date).And there`s a lot os other stuff like Metro,but i`m tired to talk about it. But what is there is enough to tell you that Windows(10) is shullbit.(Just a censor) And now i`m going to shit Linux. 1.2.1. No software. Noone uses Linux,and noone sells paid software,so noone gets money for further development. So all Linux software is buggy and/or undone. 1.2.2. Nothing is unified. Every distro uses it`s own systems. Causes much,much problems. Program that ran 4 yrs ago,most probably won`t run on new Linux distro. 1.2.3.GNU slowly dies. Believe me or not,GNU was much more active 10 years ago,and even that they still make&update awesome software,they have the same problem as other Linux developers. 1.2.4. Phew,that`s all i know. But not all that makes Linux worse. 1.3.1.I know nothing about Mac OS/X And that`s also the problem. It`s so expensive that i know nothing about it!I never tried it! I think apple should sell it atleast little less expensive. 2. EPIC EPILOGUE Right now it`s too hard to choose between Linux and Windows(But not too hard to choose Windows 7 out of all Windows) so i recommend you to do like i did,i have both Xubuntu And Windows installed on my computer. But when Windows 7 and 8 support will be stopped, it won`t be too hard to choose linux. About Mac OS/X. Right now there`s 20% of users using Mac,while only 7% is using Linux.But believe me,in next 1-3 years Mac OS/X ussers will be less,and more Linux users. About Windows.... I don`t think that anyone will switch from Windows 7,but when 2019 comes,and Windows 7(and 8) support will be stopped,it will be a signal of Microsoft`s imminent death. They still have chance to cancel Windows 10, or atleast fix bugs in it,Then maybe Microsoft will still be leading in OS development. Right now eveything we have to do is wait(And do awesome stuff for Linux,you don`t need to be an programmer,join us at gnu.org!).