Best deck for you is not necessarily the best deck for everyone else.
What is your budget?
What will rest of your system include? Amp? Speakers? etc. What types/models?
As far as "watts and such", if you are connecting mediocre speakers directly to the head-unit, "watts and such" in the deck won't matter much. Choose on features.
Do you have to have NAV?
How important is EQ and time-alignment to you?
Pioneer and Alpine's "top of the line" for convenience & features may or may not be their top of line for SQ.
Sounds like you have settled on a double-din touchscreen for whatever reason. So that is a start.
Many consider Pioneer's current best DD HU to be the AVIC-8000NEX.