There are pros and cons to both the 15s and 16s. Cons for the 15 (imo) are the wider neck and brass nut/zero fret, also it is more expensive. The 16 does away with these features and returns to the pre-15 neck width and standard nut, it is also around $1000 cheaper (I've seen some 2015s cheaper than $2099 and I've also seen some places selling them as high as $2999, 16s are listed at $1099). The biggest pro for the 15 and con 16 is the case. The 2015 has a pretty nice hardshell case compared to most gibsons had, the 2016 only comes with a gig bag. Both are neck through, and the pickups are the same both years.
This is the case for the 15
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Ps I realize prices I quoted are in USD, I'm not sure what prices in Italy in Euros plus any additional shipping and tariffs might add to the price