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Costa for sure, it offers simple and slightly cheaper coffee, and it will almost always taste better but not to a large degree, but definitely better still,
Also they usually put effort into the chocolate designs unlike Starbucks who throw it on.
But the greatest coffee is Bosnian coffee, from a traditional style cafe especially but even home brew stuff, if you can find a Bosnian cafe near you or even a Turkish one will probably do, go there instead.