If the ££ were close. Id choose the 2016. In my case it was £1000.
2016 Pros over 2015
Runs cooler
Quieter
Better Screen - wider colour gamut, greater brightness and thinner screen bezels
touch id - so useful and will only be integrated and developed increasingly! Not to mention it allows for greater security as you can now use longer and more robust passwords without needing to enter them all the time.
First gen unit
Thinner and smaller footprint chassis
Far better speakers - clarity, volume and bass
Class leading faster SSD speeds
TB - already useful and it's very early days. Imagine a year down the line...
2015 Pros over 2016
No need for dongles - I still cannot understand the hysteria over this when there are a plethora of cheap, well-made small and light dongles available that do the job very well until accessories catch up in the not so distant future. There are many posts and videos from high-end photographers and the like saying that they do not even miss the SD slot as they have dongles that only come into play only when they are back at the office.
physical Function keys - given you can be a shortcut away from the full range of function keys I do not see what has been lost here. I am now using the TB for all kinds of other context based shortcuts that speed up my output far beyond FN keys.
Battery - this is not reflective of the entire line of 2016 MBPs. I like many on here and elsewhere do not have any battery issues at all. I get 10 hours of light usage and around 8 hours of heavy usage which is excellent. The wonderful thing about Apple is that their exchange policy is so generous that anyone can get a new unit if battery life is sub-par.
Magsafe - this is surely tenuous? A dedicated port with a fixed location on the machine is antiquated. In any case, Magsafe substitutes have been released.
Last Gen unit - the 2015 is a solid machine for sure.
Things that are same
Performance : I've tested a 2015 2.8 v 2016 2.7
TB - If see little benefit of TB2 to TB3, Both are more than adequate to meet the needs of the majority of the users who will not saturate even TB2 bandwidth. Agreed
One thing I do not like, and its a personal opinion is the touchbar, i enjoyed it at first, it was a cool gimmick, but its a solution to a problem that does not exist, its actually a step backward from good design. As this is a personal preference thing, its not work debating, my summary of the situation is as follows, imagine being visually impaired, moving from the physical keys from 2015 to 2016 model.......is that good design?
This comes down to user preference as you say but the TB certainly does not hinder anyone - it is extremely easy to use in fact; it just takes a few weeks to get used to it.