I am yet to have children (probably a decade down the road) but I joke that if I have a c-section it'll be no sweat because I have had my tummy cut open before.
I have heard through the grapevine (though Meg is a real live person here who has experienced both) that a tt is more painful than a c-section, but very different.
I would imagine that the greatest difference is that after a c-section you have your lovely new baby to completely focus on, whereas after a tt the reward isn't as immediately gratifying.
(Though after a couple of months one is endlessly pleased that one was courageous enough to just do it and deal).