I'll start --
I am a life and leadership coach, a former corporate learning & development professional, a loving husband, incredibly proud father, and a voracious reader. I've delivered countless corporate team sessions on various personality assessments (e.g. MBTI, StrengthsFinder, DiSC) and have coached individuals on how to leverage their assessment results.
It's hard for me to choose a favorite assessment as nearly all of them have strengths. If pressed, I would pick the Myers-Briggs-Type-Indicator (MBTI). My results on the MBTI have served me well more times than I can count!
Your turn!