South African on a charity visa in the UK. I need a Schengen visa. What would be the easiest to get the visa? [duplicate]

You don't get a choice of which Schengen country to apply to a visa from -- it has to be the main destination of the trip you need the visa for. This can be checked because you'll need to describe your travel plans and purpose in the visa application itself, and it will be rejected unless filed with the country that's your main destination.

Of course you can go to any Schengen country's consulate and claim that you want to go on a tourist/leisure trip there, without any specific plans. However, (1) that would be lying if you in fact do have particular plans, and lying on visa applications has unpleasant ways of coming back to bite people later, (2) if you're worried about being refused the visa, your best bet will be to apply to the country where you have a detailed and convincing story to tell anyway.