I have the 2120 with the F150. I'm very happy and get about 3 MPG. I would guess the 200 would get less MPG but go faster and get up on plane quicker. I have had 2 men, fishing gear, cooler with ice and 3/4 tank of fuel and topped out at 34 MPH with the F150. That was smooth as glass conditions. I cruise at about 25 MPH, 4400 RPM. I'm happy with the F150 but everyone is different.
One point, if I were to be in some serious rip tide conditions I would want the 200 HP. I usually fish the middle bay and don't venture out in those conditions.