If taking in ranking countries which only regulating their own country and not provide licenses you can operate almost everywhere (ie. MGA, Curacao, IoM etc..), would add at least Denmark in very top of the list, also Germans new regulations are quite strict and assume reliable as well as many casinos been following them since last year (even license itself only came in action this July), Estonian one have been quite reliable as well, Isle of Man which many B2C providers don't yet use probably gonna be bit more structured now when casinos start to use it more etc...
Would probably be easier to exclude single market regulators like Spelsinspetionen, UKGC etc... as these only ever apply for players in these countries and are not really relevant for players from anywhere else.
Would say Aldernay is good as most of others, nothing really remarkable there, they are quite reliable in what they doing but if you read all their B2C/B2B regulations for operators, they are not really specific in many areas like some others who are bit more actively updating their regs.
