Christian McArdle wrote:
I am considering using white acrylic eggshell for interior doors and
staircase.
Are there any advantages or disadvantages over an oil based eggshell
paint?

Advantages (of water based acrylic):

Easier to paint (opinions do vary, however)
Environmentally friendlier
Does not yellow with age
Does not stink
Fewer nasty chemicals

Disadvantages:

Less hard wearing
Less easy to clean

I always use water based acrylic myself, as the environmental aspect is of
high importance to me.

I like it too (and TBH I'm not particularly fussed about the eco-aspect
I'm afraid). I'd add:

Advantages:
Easier to clean up equipment/spills/overpainting and easier to stay
clean while painting!
Dries very quickly

Disadvantages:
Pretty expensive compared with oil-based.

David