Hello, today I bought my very first iPhone after years of Android. OK, it's an old timer but it was free and the data plan was perfect for me plus 2 years free of Spotify as a bonus. It will be delivered to my home next Tuesday (March 15). I read all the posts about a 5s with iOS 9. I post again about the age old question "should I upgade" cause half of the answers are "iOS 9 slowed my 5s". So for the other half iOS 9 didn't slow their 5s. I"M a bit lost here. What are the best reasons I should stick to iOS 8? My Air 2 runs smooth on i OS 9.2, my iMac can boot with Mountain Lion (stock) or El Capitan. I bought the iPhone for syncing emails, notes and reminders and connecting Bluetooth in my car. No Facebook, no social media. Maybe a little Safari or Goodle+ while waiting in line at the bank. I'm the kind of guy who uses mostly Apple stuff: Mail, Safari, Notes, Reminders, Pages, etc. They suit my needs perfectly. Actually, staying inside the Apple universe was a reason not to keep on with m Android phone that was also a 2013-2014 product (HTS One s). So can you enlight the anxious guy that I am. I'm much nervous about the fact to go Apple all the way. Thanks million times.