Welcome to Android Central! It really depends on a lot of different factors important to you that we know nothing about at this time. What's important to you in a phone? Do you like TouchWiz and all of the added software and features that Samsung gives you (which you can't uninstall if you don't root), as well as the S Pen? Or do you prefer close-to-vanilla Android on the 6P with minimal bloat, and prompt system updates from Google?
Budget and carrier preference are also considerations.
Happy New Year!