The S90 would be a newer model than the Lexus for a 2yrs old now. The prev gen E250/EH300 should still be a better buy.
Higher OMV. More durable. Volvo parts not cheap.
S90 will actually be more comfy due to the better seats.
S90 also wins on gadgets and safety features.
S90 also wins on a better infortainment system.
S90 will have more power and torque.
Lexus wins on quietness.
Lexus probably will still have a better resale value end day