not sure where to post - pros of chickens, chickens vs bantams

[TLWR]

I have a couple of indian runner ducks.
What are the benefits of adding a few chickens.
Chickens vs bantams?

What can the chickens do that the ducks don't?
What about chickens and snakes? (so far no issue with the ducks)

 

[BuffOrpington88]

The ducks and chickens should not be housed together. The ducks create wet conditions which is detrimental to the chickens.
Standard chickens lay larger eggs. They are generally more available.
Bantams lay smaller eggs and require less space.
Snakes can eat the eggs and baby chicks.