Old thread but interesting, I'm still on open on what is a 'nicer' curry, I still like a traditional.
Changing the subject, I do like coming across a Madras, where the Madras uses Tamarind and leaves a slightly sour flavor in the mouth. Sadly the last Madras i came across like that was on Skye and boy did i enjoy it.
LittleChili Old school Madras recipe comes close
https://curry-recipes.co.uk/curry/index.php/topic,13709.0.html