When comparing Vundle vs Janus, the Slant community recommends Vundle for most people. In the question“What are the best plugin managers for vim?” Vundle is ranked 2nd while Janus is ranked 5th. The most important reason people chose Vundle is:
Ranked in these QuestionsQuestion Ranking
Pro Easy to use
Pro Vundle can find, install, and upgrade plugins for you
Pro Builds atop Pathogen
Janus actually uses Pathogen to manage its chosen plugins, and lets you add your own, just as you would with Pathogen.
Pro Great set of defaults
Janus is a great place to start with Vim, with much of the functionality that you would expect from a modern editor, without you having to configure it all.
Con .vimrc can get noisy
You have to list each and every plugin in your .vimrc file.