Both are good computers. With the base model 2016 13-inch, you can often find them for outstanding prices (sometimes well under $1,200.) With the 2015, you can also find them for outstanding prices.
If you are comparing the base model 2016 and base model 2015, the 2016's CPU is slightly faster, the iGPU is MUCH faster, the SSD is significantly faster, the screen is slightly better, the speakers are markedly better, the keyboard and trackpad are subjective (I really like the larger size on the 2016 13 more than I do the even larger on the 15 or the smaller on the 2015), and how good or how bad TB3/USB-C only is versus TB2/USB-A/HDMI/SDXC/MagSafe is depends on what you do & your personal preferences. The form factor of the 2016 is awesome. However, I don't completely agree with those that feel it is so much better it makes the 2015 look bad - they are both good computers and they both work well. Either could probably meet the needs of most Users, and, in many cases, what defines which is "better" is probably more personal preference than anything else.
While I do not think the base model 13-inch is a very good value at full MSRP, I got mine for a very fair deal, and so I'm highly satisfied with both.
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The negative for me with the new MacBook Pro = the USB-C cable that comes with it, is USB 2 speed.
I definitely don't have a feeling of disrespect from Apple, it is my decision to buy the thing or find something else.
My guess is that they made this decision because of USB 3.1's tendency of interfering with some 2.4 GHz signals in certain instances, which the USB 2.0 standard does not have issues with.