I use an iPhone 5s with iOS 10.02 and an iPod Touch 5g with iOS 9.3.5. Both devices work fine though are a bit sluggish. My question is if is it worth buying a new iPod 6g or iPhone se or 6s? How is the battery etc. Note that I will be usng apps for the visually impaired so for instance a good camera is crucial. Thanks for your help.