Well since this is the high school forum and you're probably going into college, I assume by programs you mean medical schools.
All medical schools offer the same basic education and you're required to take the same national boards, etc. It doesn't matter whether you want to do oncology, neurosurgery, or pathology, all medical students have the same basic curriculum. You don't specialize in medical school in pediatric emergency medicine or peds onc.
You enter a specific field once you enter/complete residency and/or fellowship. At this point, you've earned an MD/DO, and you're now essentially a physician in training. You see patients, round on different floors, work in clinics, in the OR, whatever. After residency, you can pursue a fellowship for further specialization, I.E. oncology.
For pediatric oncology, the typical path is as follows:
4 years of medical school
3 years of pediatric residency
2-3 years of pediatric oncology fellowship
Only after all this are you a pediatric oncologist. So...when you ask what programs are good for either ped onc or ped EM, it's not really an appropriate question as one doesn't specialize in medical school. You do so later on in residency and fellowship.