Why does sp hybridised orbital have more directional character than p orbital?
Ignore everything else in image , this image is just for shape comparison.

As you can see in image that so orbital is a lobe with unsymmetrical shape this leads to its more directionality.

P orbital possess equal Electron Density on both sides of the orbital , but in case of sp orbital electron density isn't equal and that's the reason why sp is more directional than p .

That's also the reason for their different Electronegativity.