Your to 3 equate exactly with mine. Four was the first I was exposed to, and will always be quintessential in my mind. As for nine and ten, honestly, I wasn't sure how the eff Tenant was ever going to measure up to Eccleston, but he did, and, frankly, the extra seasons beyond Nine's probably didn't hurt, but yeah.
Honestly, though, it's kind of like Star Trek Captains for me: Kirk is Kirk, I mean, what can you say? Legend, icon, etc. Always have a huge lace in my heart, but if you get right down to it, Sisko's my man. Very similarly, Baker is the legend, the icon, and my "first", so he will always and forever be loved, but Tenant's my Doctor if I'm pinned down. Followed very, very closely by Eccleston.
Great thing about these shows, you can talk this stuff all day long.