https://blockchair.com/compare - looks fine to me, it shows me the suggested satoshi per byte for the transaction.
Among the list, blockchair is the one that is most useful for me. But I am still looking for other that can be more useful.
The website you said to be the "most useful" does not do what you asked.
It only shows very general block statistics.
Tô know how much a bitcoin transaction will cost, you need to know how much is it size. Which depends on the number of inputs, outputs, and addresses formats.
But, glad you find something which looks useful for you. But it won't do much for you about fee estimation cost.