I'm not the best person to answer this, as the first three ducks I've owned all died within four months - one of disease, another by a hawk, and the last by a raccoon - and of the three ducklings I have now, one is sickly. But in my opinion, chickens are easier than ducks.
All of our ducks have been Pekins and they appear to be very sweet, seemingly more emotional than our BO, EE, or RIR chickens. But I don't think they are as on top of their game as chickens are when it comes to survival...the 'sitting duck' phrase for a target definitely seems to apply.
Eggs are delicious. Fattier than chicken eggs so they're more flavorful. Ours were slightly smaller than our BO and RIR eggs. She laid them all over the yard though so it was like an easter egg hunt every day.