When comparing Piggydb vs vimwiki plugin for vim, the Slant community recommends vimwiki plugin for vim for most people. In the question“What is the best cross-platform note-taking app?” vimwiki plugin for vim is ranked 23rd while Piggydb is ranked 58th.
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Pros
Pro Creativity
Piggydb is a knowledge building application. You can think of it as a mix of notetaking, outliner and concept map all together, but with the flexibility to do more than that. Its non-linear system and bottom-up or heuristic approach gives you the possibility of creativity to discover new concepts and ideas based on your input. There is no wrong way of using Piggydb. It helps you to elaborate your own knowledge.
Pro Free
Pro Hierarchical tags
Hierarchy for tags gives more flexibility than folders for classifying and structuring your content. It even allows to have parallel hierarchies for the same content using the same tags, connecting your notes together, but in different order. It is up to your needs and creativity.
Pro Internal link makes it easy to create a knowledge network
Pro Comfortable for Vim users
Has a very minimal learning curve for people already used to Vim, as the preset shortcuts are very easy to learn and don't conflict badly with other Vim behaviors.
Cons
Con Limited to use with vim only
vimwiki is a plugin for vim, so you won't be able to make use of it if you're not a vim user (and don't want to be).