i rarely eat this kind of thing, but i remember when i did, having cut the scone in half, i alternated each half.
no strong preference, but is the sort of thing i do generally.
i didn't know it was such a fought-over decision.
i had originally thought cream ought to go first as it was in place of butter, as it's a dairy product, and you wouldn't put butter on top of jam, at least i wouldn't.
but then cream is more luxurious than jam, so the basic item might be seen as jam, and if you happen to have the delicacy of cream too, then that is added on top.
i don't mind, and am not from the south-west.
but i do prefer dark jam. though i don't buy any jam.