Which of these types of ectopic pregnancy: tubal, ovarian, abdominal, uterine (outside uterine cavity but still in uterus) is most viable for birth?

None. They are all lethal to baby and mother. There are extremely rare cases of an abdominal pregnancy being viable, but these did not start out as ectopics but 'fell' out of a ruptured uterus. Ectopic is not viable, end of story.
Neither. Ectopic pregnancies are nonviable. Even abdominal pregnancies rarely result in a viable infant.

Related Questions

Uterine ectopic pregnancy is where it is in the uterus but not the uterine cavity. Why isn't it viable? Just a little more surgery at birth is needed.

Very serious. Uterine ectopic pregnancies are very serious ; potentially dangerous. They can occur in the area where the fallopian tube originates and can rupture thru the uterus causing so much damage that a hysterectomy is necessary. Can try methotrexate. Be very careful. Read more...
Ectopic. I am not sure sure how an ectopic pregnancy can be in the uterus. That's why it's called ec-topic, out of place. Usually, it is referred to tubal pregnancy, rarely to other sites such as ovaries. If you have an ultrasound that determined you have ectopic pregnancy, it should say where it is. You can scan a copy of it and send for our review or talk to your doctor who should explain it. Read more...
Misinformed? An ectopic pregnancy occurs outside of the uterine cavity in the fallopian tubes. The fallopian tubes are in no way equipped to grow a fetus. This is a potentially deadly condition. Read more...