I voted
Rose. At first I didn't like her because she looked so young (even a little pimply), with a very popular kind of beauty (Today, especially in the UK, I notice it always has to be BIG eyes, big mouth, big shiny teeth...), but looks set aside, the character grew on me. I liked the S1 finale, the bad wolf thing, how empowered she was... and how much she mattered to the Doctor. Call me a romantic.
Now I don't follow my own principles because when I first saw
Donna as a companion, I thought, what happened to young and pretty?

Set a trend, and whatever we think about it, we adopt it. We don't like change.
I reserve my definite opinion of Donna until I see her in better conditions and with her original voice, like I did most of Rose.
I like
Martha very much, but yeah, count me among those bothered by the unrequited love pattern. It's a shame how the Doctor neglected her at times. At least she had the pride to decide to leave. Sad that she was going away, but admirable.