A single turbo would provide a lot more torque at a lower RPM. I don't really care about the hp# but rather throttle response. I picked 350 in the poll.
My '15 Genesis H Trac AWD with the same engine, transmission, similar AWD and weight to the KT is very good albeit with 311hp. It's quick but not blistering fast, about 6.5 naught-60 and another 50-60 hp to break 6 seconds would be great. Would I be willing to give up 2-3 MPG for the additional speed? I don't know but probably not given that it's fine as it is. .