When comparing Emacs Org-mode vs Workflowy, the Slant community recommends Emacs Org-mode for most people. In the question“What are the best cross-platform task apps?” Emacs Org-mode is ranked 3rd while Workflowy is ranked 4th. The most important reason people chose Emacs Org-mode is:
This app's flexibility is based on its minimalist approach, giving the user near-infinite freedom.
Specs
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Pros

Pro Ultimate flexibility
This app's flexibility is based on its minimalist approach, giving the user near-infinite freedom.
Pro Absolutely free
Emacs with Org-mode is free as in beer and free as in speech – that is, it costs nothing and it’s totally open source.

Pro Files are usable anywhere at anytime
Users are not tied to one service provider, program, platform, or database engine.

Pro Incredibly extensible
There are many plug-ins for Org-mode, including Org-habits and Org-notify. If Org-mode lacks some piece of functionality, it is very easy to add it.
Pro Agenda views
Pro Excellent unofficial Android app (orgzly)

Pro Offline support
Pro Efficient features for deadline organization
Pro Supports plaintext spreadsheets
Pro There are a lot of extensions, for exporting to html, bootstrap, js-reveal and much more
Pro Quickly add rich text
Pro Outline-style hierarchy with zoom
Any sublist can be viewed as a top-level list. This sounds simple but makes WorkFlowy extremely powerful. For example, the same line item, "write my book," can simultaneously be a to-do in a task list and the container for an entire working document.
Pro Minimalistic interface
Interface has no clutter. It allows focusing on thoughts to note down. This keeps things simple and easy to understand, which can help keep everything organized in an intuitive manner.
Pro Easy to see an overview and organize notes
All notes are part of a list, which makes it easy to organize everything. Nested lists allow for organizing notes into hierarchical categories of infinite depth. All lists can be folded. WorkFlowy also has tags and instant full-text search.
Pro Super fast sync between devices
While adding a list of to-do on web, it syncs with iPhone and iPad apps very quickly. This way you can jump between devices with no delay of up to date content.
Pro Quickly focus on a specific topic
Enables users to focus on specific topic area, which is referred to as "hoisting" within Workflowy.
Pro Supports tags
Enables users to search by tags.
Pro Cross-platform web and mobile
WorkFlowy can be accessed from either a browser or their apps, which include a Chrome app for desktops as well as an iOS and Android app. This makes it easy to access ones notes no matter the platform or device being used.
Pro Deep nesting
Workflowy's 'everything is in a tree' interface makes it easy to keep expanding on topics, no matter where, or how deep in the hierarchy they are.

Pro Tasks can be added and manipulated quickly
WorkFlowy allows entering many tasks very quickly – especially useful for meeting minutes or a "brain dump" when you have to type fast. After typing in all your thoughts, it's very easy to organize and sort multiple groups at once.
Pro Import and export via OPML
OPML (Outline Processor Markup Language) is a commonly used standard for text exchange. With two-way support for OPML you are never locked into Workflowy. Importing/exporting via copy/paste of entire outlines is a snap.
Pro Text formatting
You can have bold, italic, and underlined text.
Pro Strong community
There are number of talented coders who help customize WorkFlowy with extensions and styles. It has an active blog and welcomes collaboration.
Pro Daily digest email
WorkFlowy can send you an email with that day's activity. It's a great way to track progress.
Cons
Con Unintuitive user interface
The key combinations are unintuitive and difficult to remember. This is probably because there are a lot of hidden "modes" depending on where the cursor is. Actions aren't paired with reversing actions like in other todo apps. For example, hitting shift-tab does NOT reverse the effect of hitting tab.


Con Android app isn't very good
There are several user-created apps for Android, but none seem to offer the same level of functionality as other to-do apps.
Con Not really cross platform
Although it is possible to get a lot of it working, no all in one, sync included, out of the box solution is available for mobile devices.
Con By default, a hard-to-read display
The default way of writing an outline or checklist creates a very messy wall of text that's difficult to read with no vertical spacing. You can manually add vertical spacing, but the Org operations don't preserve it. There are pretty-display modes, but you need to remember how to enable them, etc. etc.
Con Doesn't work well in mobile browsers
The functionality of the mobile version of the site is a bit limited, while new features have been added such as the ability to move lines of text, even that is limited on Android to only being functional on Chrome.
Con Offline desktop app requires Chrome
The offline desktop requires installing Google Chrome first before the WorkFlowy app can be installed. This is not good news for non-Chrome users especially users who frequently uses Firefox or Safari as their default browsers, in which Chrome app also suffers memory leak and battery issues.
Con Inconvenient interface
Notes automatically collapse, making them unreadable without user interaction. You cannot view multiple long notes at once.
Con No public API
Con Cannot use link-text
You cannot have text link to a URL. When you link to a website you have to post the full URL instead. Instead of having the name of the website or article like, Slant, you instead have to post http://slant.co
. It's especially annoying if you have a long URL that takes up a lot of space in the document.
Con No support for Right-To-Left languages
Mixed text is scrambled, and text-alignment is wrong.
Con Doesn't work on all mobile phones
Not compatible with Android OS version 4.1 and 4.2.
Con Infrequent updates and new features
WorkFlowy works well but it is hardly ever updated, in comparison to Dynalist, which works in a very similar way but has more features and is updated weekly.
Con Only supports one big text file
Although with Workflowy's focus feature this can work, you might prefer managing separate text files.
