The iPhone finger reader is very good. Angle doesn’t matter, it’s very fast, and at worst takes a couple repeat touches to engage. It doesn’t read the print per se, it reads other structures deeper in the finger. People only understand “fingerprints” in the context, so that’s the term used.
I really don't have a clue about iPhones. The only two phones that I own is my house landline and a flip-phone without even a camera on it.