When comparing TickTick vs Emacs Org-mode, 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 TickTick is ranked 6th. 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 Create checklist for a task
On each task you can choose between a text description or a checklist.
Pro Cross-platform
It’s accessible on the web, via a Chrome extension, on Android (phone/tablet, with widgets), and on iOS.

Pro Flexible recurring tasks
Recurring tasks are simple to set, and can be created according to custom rules.
Pro Customizeable Android widget
You can change the opacity, themes, lists, and cosmetic features of the widget.
Pro Smart date parsing
You can type "buy milk tomorrow 5pm" it will turn into a task as "buy milk" and reminder set as tomorrow 5pm automatically.
Pro Multiple reminders
You can add up to five reminders for different time to a single task.
Pro Smart List
Allows you to set custom filters, making it easier to find tasks.
Pro Multiple reminders
Supports up to 5 reminders per task.
Pro Advanced sorting options
Tasks can be sorted by dragging and dropping them in the list.
Pro Google Calendar integration
You can integrate TickTick with Google Calendar.
Pro Lightweight app
TickTick is resource-light, which is great if you run multiple programs or are using an older device.
Pro Clean UI
TickTick takes a minimalistic approach in order to keep things simple.
Pro Easy to add tasks
Just start typing to add a task.
Pro Has a calendar view
Pro version of the software allows tasks to be laid out in an easy to overview calendar view.

Pro Supports #hashtags (labels)
Just click a hashtag to filter your labeled tasks.
Pro Description and checklist all together
Paid users can add description and checklist into a single task all together.
Pro Set list color
You can set a different color for each list.
Pro Free task tagging
Tags are a native feature; up to five tags can be applied to each task.
Pro Great support to recurring tasks
Easy to set recurring tasks and a lot of possibilities to do that.

Pro Share task lists for collaboration
You can share a list through an email or a shareable link.
Pro Location reminder
Remind you of a task when you reach specific location.
Pro Can set duration of a task
You can set starting and ending date and time for tasks.
Pro Follows Android design guidelines
The mobile Android app of TickTick follows the Android design guidelines for a familiar interface.
Pro Keyboard shortcuts
TickTick supports keyboard shortcuts that makes it easier to work with.
Pro Custom themes for pro users
Paid users can enjoy pro themes.
Pro Recover from trash
Easy to see and recover tasks from trash if you deleted them by accident.
Pro Print tasks
Easy to print any task you want to.
Pro Siri integration
You can add tasks via Siri.
Pro Folder with concluded tasks
Easy to see all concluded tasks by date of conclusion.
Pro Support team is great
Support team responds quickly.
Pro Integration with calendars by URL
Shows your events on other calendars (like Outlook) in your task list.

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
Cons
Con No native integrations with IFTTT or Zapier
The app doesn't feature native integration with these services, but you can use this functionality by fiddling with the custom email address that is provided by TickTick.
Con unable to sync with gtasks, only imports
Con Intelligent date and time entries don't work everywhere
In some apps, you can type "call Ben tomorrow at noon" and the date and time fields will be automatically populated with "tomorrow" and "noon". TickTick has recently implemented this feature, but it doesn't work flawlessly via the webapp or via a widget. The functionality does work good within the Android app, however.
Con Free version is limited
TickTick's free version is limited to 19 task lists, 1 attachment per day, and 1 collaborator.
Con Abo model is too expensive
Con Translation to Portuguese is not professional
For Portuguese speakers, the Portuguese translation seems very amateurish.
Con No search of non-latin languages in web
The web version has no ability to search non-latin languages (e.g. Russian, Greek).
Con Interface is not clear
It has too much information, causing some confusion sometimes.
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.
