Hi
in the dive community at large, this is all down to personal preference. being able to "do" things in different fins is largely down to how well they suit your natural finning style and how willing you are to adapt.
You can maneuvre and back-fin in splits if you work out how, I can do it in twin-jets for sure. You will find it hard in floppy split-fins but no harder than in floppy paddle-fins (aqualung blades II, etc).
They say you can't get any thrust in splits. Not only can you get very good thrust, but you can likely maintain that output for longer as fatigue and cramping are less in splits. When I dived splits I had a whole liveaboard sneering at me about how I should avoid current until the guide got the current-reading wrong and we had to fin-like-fek through small crack. At that point everyone formed up line-astern behind me to slipstream me (all except the BSAC diver who used his knife and crow-bar to drag himself along the seabed)
However, this is a DIR forum and the DIR answer is stiff-short-broad-paddle fins. I dive turtles and can tell you they are ace, but I wouldn't want to fin at full power for many minutes! If you want an equal number of replies from paddle-fans and splits-fans, you are on the wrong forum
Toby