As much chain as your locker allows.
The windlasses on most Bavarias do not handle mixed chain/nylon rode and you never know how much will be on the bottom so I fitted all chain, 100 metres, and have had to use almost all of it on occasion. Kioni on Ithaca is often 20m + depths and during 75kn storm in Pula, Croatia in 2010. Also, in the tropics with shallower water, chain works better if you accidentally snag coral
We have a 2009 Bav 38 and its locker copes well with 100m of 8mm chain, even allowing for the cut down plastic milk crate we placed in the bottom of the anchor well to keep the chain out of the water that sits there.
Craig
"Shirley Valentine"
Gold Coast
Australia