Here are some further reading suggestions, covering a range of interpretations:
Andrew Roberts, Churchill: Walking with Destiny (2018)
Richard Toye, Churchill’s Empire: The World That Made Him and the World He Made (2010)
Madhusree Mukerjee, Churchill’s Secret War: The British Empire and the Ravaging of India during World War II (2013)
William Manchester, The Last Lion: Winston Spencer Churchill. (1989)
Robert Rhodes James, Churchill, A Study in Failure, 1900-1939 (1973)
Geoffrey Wheatcroft, Churchill’s Shadow: The Life and Afterlife of Winston Churchill (2021)
You can also read our blog posts that summarise the cases for and against Winston Churchill.