Used Nissan Altima

I am thinking about getting a used Nissan Altima and now I kinda narrowed down to two choices. One is a 2015 Nissan Altima SV with a 36000 mileage, and the other one is a 2017 Nissan Altima with a 50000 mileage. The 2015 one was a private-owned car while the 2017 one was a rental car. The prices are all acceptable and within my budget. Which one should I choose?