Do most global and big companies (fortune 500) now use OSX (apple) instead of Microsoft?

I just noticed that most companies and people on wall street are using macbooks and imac(s) in their work place instead of microsoft running laptops and computers, in addition many use the iphone instead of android phones. Does this mean that apple is much more easy to use, more reliable? More stable? I mean ofcourse, considering the costs, I don't think they would invest in such machines right? So there must be really something about them.

Snapchat crashing when I hold down to record on iPhone?

I have Snapchat installed on my iPhone 5 which is runing on iOS 9.0.2. My device is jailbroken and I do have the Phantom tweak installed. Both Snapchat and Phantom are updated to the latest version. I have tried to delete and reinstall both Snapchat and Phantom but still doesn't work. I have tried to reset network settings and still didn't work. I have tried the 'Clean up Snapchat' option from the Phantom tweak in Settings. I have tried deleting Snapchat and reinstalling it using my PC. I have also tried to delete apps, videos photos etc. That I don't use. Is there a reliable way to fix it?

IPhone screen blank after dropping it and it overheating?

IPhone screen blank after dropping it and it overheating?

Added (1). I dropped my phone this morning and the screen went black, but every time I picked it up it was hot, like it was overheating and now it's fine but still won't turn on? Any ideas?

Some songs are not transferring from iTunes to my iPhone 5S?

On a website I found where I can download free songs, put them on iTunes (I made a playlist), and add them to my iPhone. From my iTunes playlist, I right click and add them where it says my name and "iPhone". Recently, some songs that I want are not added to my phone when I do this. Why is that?

I don't know if I should update my iphone?

So I have an iPhone 6 with ios 8.1.2 on it and I didn't make the update to ios 9 when I should and right now it shows that I need to make the update to the newest version of ios 9.1.2 and I'm afaraid to do it. Can someone help me and tell me if something will happen like the photos or apps will be erased or maybe my phone will work slow or will not work at all after update because it's a huge jump from ios 8.1.2 to 9.1.2. Can someone give me an advice please? I don't know what to do. To make the update or not? ( I regret that I didn't make the update at time ) ugh.