Single screw can be good; single gas (petrol) can be OK; inboard, I/O, outboard
can all work...
But in general, the hull
shape on that particular boat is likely more comfortable at planning speeds, may or may not be comfortable at hull speed
depending on sea states... and without a keel
, it might not track all that well at hull
speeds either. (That "worming" thing, I bet.)
A single-screw diesel
(inboard or I/O) would usually cost more to buy but will usually be less expensive to run. A hull with a keel
will usually track better at slow speeds.
But it's all very relative... and as usual, YMMV.
You can sometimes find engine manufacturer's performance curves (including fuel consumption
at various RPMs) on their websites.