Most notable examples of both are China and India, where China outperforms India even despite decades of violent Communist rule.
China did have interactions with Britain, disputes over trade, access, addictive drug running, gunboat diplomacy et al. but these usually fall under British Imperialism rather than British Colonialism.
India you should compare to India's trajectory had British rule not occurred.
How? Fantasize?
You do seem to make a lot of unsupported statements that seem more akin to belief than observable facts.