Thany has 12 base speed. Which is great, except for that 4 base con. Sue has 8 base speed, with 5 con. (Woo, so much better. >.>)
This may seem like it's a lot worse, however, an iron lance has 8 weight, while the iron bow has 5 weight.
You could use a slim lance, but I'm looking at them with iron. (When you're doubling everything anyway, why not go for extra might? Both of their strengths suck. :( )
12 - (8 - 4) = 8
8 - (5 - 5) = 8
8 = 8
Therefore, they have the same base speed.
(You can get a slim lance, with it, Thany has 4 more speed.)
In the end, they're both going to cap it anyway.
Oh, and sue. 6/10 + 1 = 7/10, for reasons others have stated (+ one bias point).