You'll get lots of differing opinions on the matter, but out of those options I think your best bet would be the Children's.
Diamonds can be a bit tricky, and if I recall can be prone to death when not kept in cooler temps (sorry if I am mixing up species here). A Darwin Carpet is likely fine, but Morelia can sometimes be assholes - especially when young. Still, it gets you used to being bit and you can grow with it.
Obviously all individual snakes can differ. You can get docile snakes in species that tend to be a bit snappier and vice versa.
Is a Stimmie an option? I tend to be quite partial to them and my one is a little angel compared to some other snakes I have interacted with. Never had a food response bite or anything (not even a headbutt). That being said, I haven't handled him since last year.