I have a theory, the current doctor when you started watching is your favorite doctor. Would this apply to you?
I started watching Dr who when the reboot was 3 seasons in, I think David Tennant was the greatest doctor. A few years later I finally got wife to give it a shot as I started a fresh rewatch in preparation for Matt Smith's second season, she was ok with Eccelston and Tennant but Matt Smith is far and away her favorite doctor. Does this pattern hold true for any other Dr fans?
Started with Nine but his one season felt like an intro to Doctor Who. Ten became way too over the top and exhausting for me. Eleven came in and immediately I knew, this was My Doctor. He was fun, zany and had that thrill of adventure and optimism. But also could be terrifying, quiet and sadly understanding of reality.
The others after that just never clicked in the same way for me. For me, the sense of fun and wonder was what drew me to Doctor Who.