Western Star vs Peterbilt (Cummins vs Detroit?

Been looking at triaxle tractors lately and wanted to see what people think of the 2017 Western Star 4900SF w/ DD16 Detroit (605/2050) vs the 2018 Peterbilt 389 w/ X15 Cummins (605/2050). Both with the 18SPD Eaton. How do people like the Western Stars? When I lived in Vermont they were an incredibly popular truck. Love the 389's but wanted to see if anyone had any experience with the X15 Cummins? Any advice is greatly appreciated, Thanks, John

Western Star vs Peterbilt (Cummins vs Detroit?