Answers: They're essentially the same, they're both prompt acting insulins. Humalog works the tiniest bit faster. It's a better choice for our 5 year old: Being so infantile, she's not always competent to commit to the carbs she's been given (eyes are bigger than the stomach logic). This is coupled by the certainty that she's a munchkin and doesn't get a ton of insulin, every partially unit matter when counting carbs, due to her weight. Gina get her insulin mid- to end-meal for a safer bolus. Humalog works around 5 minutes faster.
Pretty sure novalog comes from pork and humalog from humans.