Thanks Cleansweep.
All things being equal I’d definately take both but the pony poo is available now, and more importantly – free!
Great point about the risk of Aminopyralid which I’d forgotten about. I assume the risk is low in this case as the ponys belong to a anthroposophic setup (which I perhaps mistakenly think of as “organic plus”). I will have to check up on the source of food and bedding for the ponys.
I suppose my main question was whether the compost produced from either the cow muck or the pony poo was better to use than the other. That might be something to do with your reference to beer which sadly now living on the continent I drink very little of – oh for a pint of Black Sheep in a Dales pub on a summer evening!!!