What's your favorite superpower of Superman's and why ?

What's your favorite superpower of (younger or older) Superman and
please say why (compared to his other ones) ?

Super fast flying ability and speed is terrific, but for me it's his
super physical strength superpower, that's the basis of everything he
does.    Without that particular power, he'd almost be on the level
of Batman (who's cool in his own unique way, but I like Superman
better).