Ranked in these QuestionsQuestion Ranking
Pro Fast code completion
Kdevelop indices all your classes, methods, functions and global variables in memory, which makes class/method lookups to complete in no time.
Pro Best in industry syntax highlighing
Kdevelop has very unique syntax highlighting. It's very addicting - other IDE will soon look monochrome to you.
Pro Very lean on CPU and RAM
Even quite large projects occupy only several hundreds megabytes of RAM. Try that in Eclipse...
Con Only preliminary support for Windows
The Windows version is still in alpha.