A bad parent who managed to instill altruism, compassion and love in Diana.
Which is easy to do when you live in a perfect society and are loved as the only child that society had seen in centuries. The only thing Diana had to worry about when her power manifested itself was Ares finding her. There was some shock from the Amazons, but given that they were in a perfect and loving society, and that Diana was the apple of that society's eye for....I don't recall if she aged slower as a child or not. But that's beside the point, she had the love of the entire society, not just Hippolyta and her aunt. That society would not have feared her, just been momentarily astonished at the shock wave.
Clark on the other hand had his parents love, but grew up in a fearful and often times hateful world. He didn't grow up having society's love, nor did he grow up in the lap of luxury as the child of the ruler of the land. He's pretty much on the opposite end of the spectrum as Princess Diana. Clark grows up seeing the harsh realities of the world first hand. He knows he's different from a younger age. He gets bullied as a child, unlike Diana. Seriously, watch this clip, look at how big the group of kids is that are okay with him being dragged from his truck and harassed.
Based on the bully's comment about "fighting back", I'm guessing Clark has a rep for not fighting back. Look at the hatred in that kids eyes. Look at how many are going along with it. Clark is getting a look at this harsh reality at a much younger age than Princess Diana. He's the target of it. She wasn't. And out of that entire group, only one kid holds out his hand to help Clark up. That's the kind of world Pa Kent is staring down. The bully hates Kent and the others are willing to go along with, or are indifferent to this bullying. If Clark used his powers to push back, that kid would just find a way to turn that against Clark too, especially if Clark showed some power in a moment of anger. "S..s..see!? He's some kind of freak! He's not like us!" It's a microcosm of the world playing out here.
So Clark is more introspective, more stoic, more willing to silently observe the world around him. The "strong, but silent" type. And despite all the shit he had to put up with as a kid. Despite growing up two steps away from being poor. Despite living in a world that's more given over to fear, he is still driven to help people. Without reserve, without hesitation, without fail. That's a Superman that interests me. Not one who delivers Public Service Announcements about statistics regarding the safety of the airline industry.
Sorry about the length of that reply. It just got away from me.
So...about Wonder Woman...Still an awesome film and still one of my favorite super hero movies of all time.