Which Mono Speedy 25 or 30?

I have the mono Speedy 25, I tried the mono Speedy 30 in the store and it was just too big for me. I don't need a bag that big and I don't have that much stuff to tote around. I am 5'6. Sorry I dont have any pics :sad:
I have both - I ended up giving my daughter the 25 because I like the 30 so much better. Once I got the 30, I never used the 25 anymore. It's not that much bigger - but big enough to be easier to get in and out of and it holds just enough more things. I am 5'3.
I am tall and like big bags...I went with the 30 and wish that I would have gotten the 35...I find the 30 too small and I am tempted to get a 35 but, then I would own two mono speedies and I do not need two....
I prefer 25, even though I think it's tiny. I find 30 too big, even though I have bigger bags (they tend to be more vertical, though).

I wish there was a size in between. But I'd still go for the 25.