It's hard to compare one boat vs. another with different fins. But perhaps this information will give you a better idea.
I have an Adventure (bear with me here). Cruising along at a very leisurely 40 cycles per minute, with standard fins the boat goes along at 5.2 KPH. With Turbofins and the same stroke rate, I get about 7.2 KPH
Speed it up a bit to 60 cycles per minute and the standard fins would give you 7.2 and the Turbos would do 9.2. Regardless of the boat, this gives you a sense about how much difference the fins make.
Now, the Sport, while slower than the Outback, shouldn't be that much slower at cruise speed (which is nowhere near hull speed). So, I would guess the Turbofins would propel you faster vs. standard fins in the Outback. Additionally, they accelerate faster and make a better "daggerboard" if you ever get a sail.
Being the minimalist that you are, I would suggest the Turbos with Sport. A local gentleman uses this combination and loves it -- easy to handle, maneuverable and does not lack for cruising speed!