2015, 2016, 2018, 2019, 2021

I am looking at 4 different Highlanders, all within the price range of 16k to 26k. Is there any one year that's better or worse? I know 2017 is supposed to be avoided. The '15 is Platinum fwiw and a $20k price tag for a private sale, though I am hoping it can go down in price. 110k miles on it. Thank you!