Components: Shimano Ultegra vs. SRAM Rival

[Ana]

I've decided to take the plunge and get a new bike (eeek, so excited!).

Now I'm faced with the dilemma....Shimano Ultegra or SRAM Rival?

I have 105 right now and I am planning to get a compact double with a 12-27 in back. Therefore, I have more experience with Shimano groupsets than SRAM. A woman with which I ride has SRAM and I attempted to help her with her shifting at one point and was not particularly impressed with it... I can't afford Campy at the moment so that will just have to wait.

I've heard the SRAM might not shift as smoothly but I wanted to ask the experienced female riders here

Any recommendations (especially from those who have used both) would be greatly appreciated

Oh yes, and I will post pictures, etc when I get the bike (if I don't change my mind before I confirm it tomorrow... )