Of the two, I'd say speedy. The sac plat is really long and it looks hard to get in and out of. I saw a woman with one and she really had to reach to get her wallet.
Yes i already have the Speedy 25 in mono but i'm going to exchange it for a new bag because i don't like it. Before I had the Speedy 40 but i resold it.
i agree with whistlerchic, they are very 2 different styles.What will you use it for? The DAMIER sac plat would look superb for office/papers etc and speedy is more 'casual'. It looks like you subconsciously don't like speedies? (exchanging the 25 and selling the 40). Or do you miss it and want it back? lol