Cochins by far. It's a tie between one of my GL and an LB I used to own...both are great mothers.
I have had a Sumatra go broody on me once but she ended up leaving the eggs after about a week. Another time I had a Light Sussex go broody but when they eggs went to hatch, she didn't get off and the chicks smothered
Oh and as for ducks--MUSCOVIES hands down! They will hatch chickens, geese and duck eggs! VERY determined and great mothers!
Here are some funny broody pics...
This was during my coop remodel a few years back--ALL of my breeds were thrown in together...and yes, there were more nest boxes than this--but all three insisted on sitting in there. There was ONE EGG!
Brown pied Muscovy, black sumatra and bantam Fav!
Broody Beatrice! She LOVES chicks. She actually will adopt ones I have hatched from the incubator without her ever being broody. I just put her in the brooder box at night and in the morning I dump in a box of chicks. She wakes up and must think she hatched them all but doesn't remember setting for 3 weeks?
BTW--I like your avatar & name on here....I have Creves too....actually I just posted an auction for some hatching eggs tonight.