Gee, Nietzsche's opinions of almost everyone go well past the libel border, and that's no exaggeration.
Russell's History is a good read, lots of good jokes as usual, but there are much fairer and more accurate histories of philosophy. e.g. I like Copleston's multi-volume History of Philosophy, or reading in the Stanford encyc of philosophy on particular topics/people. https://plato.stanford.edu/
My favourite historical philosophy book is Santayana's Egotism in German Philosophy[0], which covers from Leibniz to the Nazi philosophy - and was written in 1916! Kant, Fichte, Hegel, Schopenhauer, Nietzsche etc. Santayana's sense of humour is much more gentle than Russell or Nietzsche's, more a wise twinkle in his eye. For example, Ch.2 The Protestant Heritage begins:
"The German people, according to Fichte and Hegel, are called by the plan of Providence to occupy the supreme place in the history of the universe. A little consideration of this belief will perhaps lead us more surely to the heart of German philosophy than would the usual laborious approach to it through what is called the theory of knowledge."
- comedic genius. He wrote other great historical surveys, e.g. Winds of Doctrine and Character and Opinion in the U.S. When I read him, on Emerson or Nietzsche, say, I'm always amazed how he puts his finger on the crux of the matter so elegantly, and describes so clearly what others can't even see.
[0] https://archive.org/details/egotismingermanp48431gut
(Am a huge fan of both Russell and Nietzsche, they're both among my favourite writers of prose.)