I think you;re going to have a hard time deciding because I think that there are equal numbers in favor of one or the other (or BOTH!) on the forum.
His Angel - It really depends on what you are carrying, and I think how it looks proportionally. I am 5'3" and thought that the Speedy 30 did not look right on me. Also, when I use my Speedy 25, I tend not to carry alot, although I can comfortably fit my cell, blackberry, my LV Medium agenda, umbrella, and a small book.