Oddly enough I find the collaboration more interesting now. Not sure if that’s a getting older thing but I like managing the PR’s, ensuring code is of a high quality and serving the needs of the users.
I do both, and they have their own unique rewards. Writing personal projects is an exercise in self-improvement–it really doesn't matter all that much how your project turns out–while working on projects with others means you need to care about how other people and your project is improving. But in return you get to interact with people, show off your skills, receive and provide help…all useful skills in their own right.
