Hello and welcome! I have the Honor 8 and love it! It is probably the best bang for your buck. The fingerprint scanner is in a great location, as well; and I believe it is newer than the P9 (not sure, though). The P9 is also a great choice and would indeed be at a great price because of the P10.
What size are you looking for? The Honor 8 is a great size at 5.2", as well as the P9. I believe the P9 is greater. Keep in mind that the Honor 8 has some great specs but is a mid range device, whereas the P9 is a flagship device. But both are great!
If you have any specific questions about the Honor 8, feel free to ask! I do like the P9, so I think you wouldn't go wrong with either purchase.