Hi, you won’t get the enhanced Apple Intelligence features in the iPhone 13 Pro Max unless you upgrade to the 15 Pro. The iPhone 13 Pro Max is still a solid choice, but it may only receive OS updates for another 3 to 4 years. Additionally, it has a 12 MP camera compared to the 48 MP camera in the 15 Plus. The 15 Plus also offers USB-C instead of the Lightning connector and includes the Dynamic Island feature. From a pricing perspective, the iPhone 13 Pro Max is currently much more affordable compared to the iPhone 15 Plus. Hope this helps.
Hi Rijo, Thank you for your comment. Yes updating from iOS 16.6 directly to iOS 18 is possible. please ensure atleast 9 to 10 GB space is available in phone before updating.