Jon Pertwee wasn't the first Doctor I saw. In fact, thanks to the way Doctor Who aired on the PBS affiliate I got as a kid (KSPS out of Spokane, WA) he was the last of the classic Doctors I saw. The first time I saw anything with Pertwee was The Five Doctors, at a time when I was somewhat new to the show and wasn't at all familiar with anything prior to Tom Baker.
That left a lot of time and a lot of stories to get my preferences set but anything I thought I liked before I saw Pertwee got blown out of the water when I finally saw his stories. The dynamic with Liz was great, as it was with Jo; Sarah Jane was fantastic in her first season, alongside Pertwee. I'm not much of an action fan but he had that going. My Doctor has to be alien and Pertwee did that oh so well, between always referencing extraterrestrial races or places and his fascination with Venus among other things. The earthbound nature of the early stories never sat as poorly with me as it did with many, and although there's no shortage of it most anywhere in the show's history I felt the Pertwee era stoked my imagination like no other Doctor's. And the style! I'm no fashionista but the man oozed style.
Overall it was the stories that got me. Season 7 is just so damned strong and when you start a Doctor with stories like Pertwee had it's bound to make an impression. Then once those are seen, WHAM! Season 8 with the back-to-back-to-back-to-back-to-back Master stories just keeps the morphine drip going. It was nothing I considered as a kid but so much of the credit has to go to Barry Letts for doing what he did with Pertwee's time, his influence above all others (save Pertwee for his acting) made the era for me and made it my favourite.
Day 01 - Your Favorite Quote
Day 02 - Your Favorite Classic Series Episode
Day 03 - Your Favorite New Series Episode
Day 04 - Your Favorite Doctor
Day 05 - Your Favorite Companion
Day 06 - Whatever Tickles Your Fancy
Day 07 - Your Favorite Piece of Music
Day 08 - A Who-Related Photo That Makes You Happy
Day 09 - A Who-Related Photo That Makes You Angry/Sad
Day 10 - A Who-Related Photo That You Took
Day 11 - Your Favorite Season (Classic or New)
Day 12 - Whatever Tickles Your Fancy
Day 13 - Your Favorite Villain
Day 14 - The Villain Who Scared You the Most
Day 15 - Favorite Who-Related Tumblr
Day 16 - Your Favorite Who-Related FanFic
Day 17 - A Piece of Who-Related FanArt
Day 18 - Whatever Tickles Your Fancy
Day 20 - The Character Who Is Most Like You
Day 21 - Your Doctor Who OTP
Day 22 - A Who-Related Fan-Site
Day 23 - A Who-Related YouTube Video
Day 24 - Whatever Tickles Your Fancy
Day 25 - Favorite Who Actor
Day 26 - Favorite Who Actress
Day 27 - An Episode You Wish Hadn't Been Made
Day 28 - An Episode Idea You Created Yourself
Day 29 - Who& You Think Should Be the Next Doctor
Day 30 - Whatever Tickles Your Fancy