To every thing there is a season, and we’re fast approaching the time when Apple harvests the fruit of the last year and releases new versions of macOS, iOS, watchOS, and tvOS. There are no major surprises here, since Apple announced the new versions in June and public betas have been available since that announcement. But once macOS 10.13 High Sierra, iOS 11, watchOS 4, and tvOS 11 become available for free download, you’ll need to decide when you’re going to install them.
(Note that we say when and not if. There’s no harm in delaying major operating system upgrades until Apple has had a chance to squash the initial bugs and you have time to focus on the task. But waiting too long puts you at risk from security vulnerabilities and prevents you from taking advantage of new integrations between Apple’s devices. Plus, should you have to replace an Apple device unexpectedly, you will likely be forced to use the current operating system, which could be awkward if you weren’t ready for the upgrade.)
The hardest decision to make is with macOS 10.13 High Sierra. In keeping with Apple’s cycle of macOS upgrades, High Sierra focuses on under-the-hood enhancements, most notably the switch to the new APFS file system and behind-the-scenes HEVC/HEIF formats for videos and photos. But apart from improved performance and reduced storage needs, neither of those changes will impact your everyday Mac experience. Tweaks to apps like Photos, Safari, and Messages will also be welcome but are far from essential. So our recommendation is to wait until at least version 10.13.1 or even 10.13.2 before upgrading. That gives you time to make sure your key apps are compatible with High Sierra and for Apple to resolve any unanticipated problems.