i got a quote for Trane HVAC system for with XR14 + XR80 + 2.5 ton + Thermostat XL800. Then I asked him to upgrade it to XR14 + XL80 + 3 ton + Thermostat XL800 with same price. But he said, he can give it to me with additional $150. Is it worth ? or should I stick with XR80 + 2.5 ton ? How efficien XL80 compare to XR80 ?

We live in Townhouse in SoCal area, it's about 1200 sq ft, 2 stories.

thanks in advance!