The most common ones are Greek and Turkish but I am partial to the ones in East London which are the Bangladeshi ones.
They are different in the sense, they are sliced and cooked on the grill with onions, coriander, sometimes tomatoes and hatkora/lemon juice/house chilli sauce which makes the doner meat extremely tasty and moist.
The doner at Royal PFC was an example of a good one and it came with a homemade naan bread as opposed to those ready made pittas.
Will be back in East London to review other doner kebab shops.