Okay theres so many coins, thy mostly differ just small things.
What specs would you thnk are best fo PoS coins - what stake, what age, hw many etc
It all depends on what you intend to do with it to be honest, and that decision you make would reflect in the sort of people you get to invest, some people like low POS % others like massive money supplies and massive POS % per year.
There really is no wrong or right answer to this question, its just like asking what women does everyone like, some will see blonds, others ginger, and the odd one will say grey with big (.)(.)
My advice is do what you want and replicate the sort of coin you would buy into, at least that way you can explain why you think people should buy into it.
Of coarse I could have read your question wrong, and you maybe looking for advice in what coin to invest into, if so apologies....