Since I've been very heavily using Personal Brain for quite a while now I think I completely got the overall concept so I could distinguish what are main differences between Personal Brain and Evernote and similar apps
Made those conclusions while brainstorming with a mind map in PersonalBrain but will post as just text:
Evernote has:
Notebooks ( which work kind of like Types in Personal Brain)
Tags
Notes
PersonalBrain has:
Types
Tags
Thoughts (which work kind of like both tags and notes in Evernote but also provide a lot more functionality, more on that below)
Main differences:
Evernote has a strict hierarchy for tags(which are used as topics/categories).
Sure you can have a note under multiple tags but then a note is not a category(tag is). And you can't have multiple connections for categories in any way except for keeping those connections in your head. (well in theory you could write about those connections in notes as well

but then it's not practical and still hard to navigate and review )
PersonalBrain has a dynamic hierarchy for thoughts (which are used as notes as well as topics/categories and then they could also be further grouped by Types and Tags) and a strict hierarchy for Types and Tags (which aren't used for navigation as in Evernote and instead are used for filtering based on multiple criteria and more)
Evernote pros
- It's easier to understand the concept
- Fast to capture web content
- great mobile support
Evernote cons
- So basically remove all functionality from PersonalBrain except Types and Tags and you get Evernote (kind of)
- only an outline view is available, no visualization and multiple connections
PersonalBrain pros
- allows to visualize all kinds of connections and dynamic mind maps without strict hierarchies and etc.
- possible to make unlimited connections between related categories and information
- Better search (can search for categories instead of just notes as in Evernote. Also can use wildcards for search anywhere in the word and more)
- faster to find and review data because of connections and multiple views/ways to look at the information
- could be used as a better brainstorming and thinking tool compared to only basic text notes with multiple tags storage tool (evernote)
PersonalBrain cons
- Slower to capture web content compared to Evernote (so I use Evernote as an additional Inbox)
- Limited mobile version