Audi TT mk3 2015 or 2016 ?

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Hello everyone, i'm new here and in a process of buying used Audi MK3 car (year 2015 or 2016 - 2.0 vs 1.8), i'm deciding between the two because pricewise they are similar. Could you share some information on the main differences between 2015 and 2016 model year ? Are there any benefits to 2016 model ? I know 1.8 has less power but i think based on multiple reviews that 180 hp is more than enough because the car is super light.

Additional question is what the difference is between S-line and standard version ? I'm looking into 1.8 TFSI S-line 2016 for around 20k pounds - would you go for it ? I'm based near germany so TT's are more expensive than in UK i think

If any of you have any insight on what to pick or what you would pick please advise.