I have the Pegperego. Have yet to use it but it seems compact and big at the same time. Once you take the newborn inserts out, Munchkin (2yrs) was only a fraction to big for it.
Having said that, I've never really dealt with another capsule before.
But we got it 'cause DH's car is teeny. The difference in space was pretty noticeable.
We decided on it because it fit into our P&T.