I'll always love the GameCube controller, and how it moulded perfectly into my hands, making me want to keep playing..
The Dual Shock, on the other hand, is horrible. Just absolutely, positively, horrible.. From the awkward design to how uncomfortable it felt, to those damn too-smooth, too-loose umbrella analogue sticks in the non dominant position with them also being used as buttons, to the awful shoulder button layout to the split D-Pad to those bloody shapes on the face buttons! Ugh..