There is no easy answer to this, everyone has a different view and taste as I have mentioned before is entirely subjective. I can recommend what I believe makes a great cup of coffee -I think a decent fruity medium roast should be brewed as a filter coffee to really taste the bean, especially a single origin bean, anything more done to it and the taste will be brewed out leaving a watery insipid flavour. I feel the same about my dark roast, it works perfectly as a filter coffee and making it in anything stronger takes away the single origin depth of flavour, although I do know some people like it as an espresso. If I need to make it extra strong I will add less water, but as a filter it works beautifully. I have a gorgeous espresso, it's a fine grind and I have tried it in both a mocha stove top coffee maker and also in a bean to cup machine, both are excellent. I also know customers who drank my espresso as a filter coffee, great flavour but far too much caffeine for me.