I've never watched any other version of "Doctor Who" than the one starring Tom Baker, and have no desire to. In the same way that Laurence Olivier is "Richard the III", Tom Baker IS "Doctor Who". They started playing the Baker re-runs every Saturday morning while I was still in my teens, and I used to look forward to them, sometimes days in advance (I'm sorry to admit). I would often drag my hung-over self out of bed to catch the "Doctor".
I must also confess that a major part of my enjoyment of the show was Elisabeth Sladen as "Sarah Jane Smith". I was still young enough to develop an ENORMOUS crush on her (in addition to my enormous crushes on Marilyn Chambers, Kay Parker, Sophia Loren, Barbara Payton, Allison Hayes, Marla English, Irish McCalla, Cher, Roberta Pedon, Linda Blair, etc. etc.). "Sarah Jane" wasn't beautiful, but she was quite pretty, and "spirited" (I think that's how they refer to it in merry ol' England, isn't it?). I spent a great deal of time while watching the show wishing that she were my "travelling companion" instead of the Doctor's. In the last episode she appeared in, the one where she says her "goodbye" to the Doctor, I actually was teary-eyed.
I thought Louise Jameson as "Leila" was sexy as hell, but she never replaced "Sarah Jane" in my affections.