Of these, which one might provide longer flights at hover and slow cruise (something like less than a meter per second)?
Thanks
Neither, all of those look like plane propellers with way pitch too high for rotorcraft use.
For maximum efficiency you generally want to use blades that look like those
In all seriousness for efficiency you will need maximum diameter props your frame supports at the correct pitch for your propulsion to provide 2:1 thrust to weight ratio at lowish battery voltage and to maximize efficiency at hover thrust.
The easiest way to get close would be to use www.eCalc.ch.
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But the second one looks like DJI props. I checked a few props from ecalc and the max flight time I see from the ones I checked is from “Generic Thin”
I would be very careful with generic props in eCalc, you don’t know their assumptions.
Generally with rotors, same as with wings, higher aspect ratios tend to be more efficient.
Okay, whatever “generic props” look like, the next best stuff seem to be DJI and APC SF. They both look like the second image right? Or is there difference?
Looks can be deceiving. SF props don’t look like they would take to constant rapid RPM changes too well with their thin roots.
Okay, but I don’t see why that would matter much for an endurance drone rather than an FPV/race drone