Cmax is no bigger than a golf, just a little taller and much better packaging. Great family car, like a van when you take the rear seats out and drives very nice. C4 Picasso is a little longer and wider than the Cmax but as I said you can fit 3x ISOfix seat across the rear seat which is rare. Really nice smooth drive - not sporty! but if its only a family wagon! Both are much easier getting small kids in and out the back seats due to the higher roof line - saves your back and head!