See my computers wishlist.
I still use the 2015 Macbook Pro for my travel needs. But I might move to the iMac 5K for my Mercedes Sprinter photographer adventure van for field work, now that the Gator Cases Creative Pro 27" iMac Carry Tote makes it practical to stow safely and conveniently—it is a handsome and very nicely made case.
Apple often moves to new tech before supporting things are ready, and the 4 USB-C ports are no exception. Even today there is no equivalent convenience, it being awkward to hook up a Mini DisplayPort display or download an SD card or attach any USB-A peripheral (adapter required for all these things). The port hassles are a nuisance in many situations, and if one forgets adapters, it’s game over for USB-A peripherals.
While the OWC Thunderbolt-3 Dock solves all these issues, it requires A/C wall power and is thus not a solution for an airplane or car or just unplugged from A/C anywhere.See my review of the OWC Thunderbolt 3 Dock as well as Connecting a Dual-Link DVI-D Display to new Macs with Thunderbolt 3 / USB-C.
But many users don’t attach anything at all except perhaps an external drive—so one simple adapter does that. Buy several and stick 'em in the bag.
The 2017 MacBook Pro *is* a better machine, but it’s a modest gain that won’t matter to most users. See my reviews of the Apple 2016 and 2017 MacBook Pro to see how it stacks up, including against an iMac 5K and 2015 MacBook Pro (which I still use).
The discounts on the late 2016 MacBook Pro are highly attractive, and for any student or traveler, the differences are so modest that saving the money or instead getting a larger SSD or faster CPU just make a ton of sense. For photographers who must have the fastest, pay the premium for the 2017 model, though I still prefer the 2015 MacBook Pro for its port convenience.
I strongly recommend 16GB memory for any power user, but for basic usage for web and email, 8GB suffices. Ditto for 1TB vs 512GB or 256GB, but there I advise at least 512GB as it is too much of a hassle to use an external drive except for backups.
The 2016 MacBook Pro 2.7 GHz / 16GB / 512GB offers a whopping discount and it is a very capable machine.