depends on your needs- i love my matelasse- it is classic with a funky edge. the twiggy is adorable, but i like the matelasse's subversive/classic edge.
I love the look of the matelasse but every time I've ever tried it on, it just doesn't feel right - too boxy or something. So, I vote for the Twiggy - it is a great shape, not too small, not too big.
I love the twiggy. I would only get the matelasse if it were on sale and in a color I love. The width of it looks so much bigger than the twiggy. I think the twiggy is the perfect size.