I could be wrong, I'm down sick at the moment and feeling rather psychedelic, but this is a tentative list I compiled. If I've miscounted one please tell me.
- Stingray-class Sprint
- NX-Class Cruise
- Curiosity-class Balanced/experimental
- Cygnus-class Cruise
- Sagarmatha Quad/balanced/experimental
- Kea-class Sprint
- Archer-class Sprint
- Excalibur-class Sprint
- Project Darwin Balanced
For about half the ships we have flying now we had no input as to nacelle config at all, on my quick and feverish flip through these ones we had choice. 4 times we chose sprint, 3 times we chose balanced, 2 times we chose cruise config. It's also worth noting that 2/3 of the times we chose balanced, it was an experimental option.
I think this is pretty strong evidence that we favour sprint speed. It's not necessarily a bad thing, I think the Stingray-class and Excalibur-class absolutely made the objectively optimal decision to do so, but at other times I believe we did not.
This is just information people can be aware of, to perhaps help inform their choices.