Couple of things: '14, '15 best for fitting an upgraded sound system. '16, '17, '17.5 are BETTER re interior noise... but '18 and '19 are best (I guess, along with '20) for interior noise (at a cost of a couple hundred lbs weight increase). Manual transmissions (in the USA) are available for '14 thru '18 (naturally aspirated). Highest performance: '18, '19, '20 Turbo.
'18, at least, in naturally aspirated, 6MT, does not have cylinder deativation... whereas the 6AT naturally aspirated DOES have this. I may have this wrong. It may apply to the '19's... I do, however, note that the 6MT transmission is NOT available for '19 or '20.
At least I think I am right, here. Please, Others, chime in...