When comparing TickTick vs Producteev, the Slant community recommends TickTick for most people. In the question“What is the best cross-platform to-do list app?” TickTick is ranked 4th while Producteev is ranked 39th. The most important reason people chose TickTick is:
On each task you can choose between a text description or a checklist.
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 Advanced sorting options
Tasks can be sorted by dragging and dropping them in the list.
Pro Cross-platform
It’s accessible on the web, via a Chrome extension, on Android (phone/tablet, with widgets), and on iOS.
Pro Lightweight app
TickTick is resource-light, which is great if you run multiple programs or are using an older device.
Pro Google Calendar integration
You can integrate TickTick with Google Calendar.
Pro Follows Android design guidelines
The mobile Android app of TickTick follows the Android design guidelines for a familiar interface.
Pro Clean UI
TickTick takes a minimalistic approach in order to keep things simple.
Pro Has a calendar view
Pro version of the software allows tasks to be laid out in an easy to overview calendar view.
Pro Easy to add tasks
Just start typing to add a task.

Pro Supports #hashtags (labels)
Just click a hashtag to filter your labeled tasks.
Pro Free task tagging
Tags are a native feature; up to five tags can be applied to each task.
Pro Location reminder
Remind you of a task when you reach specific location.

Pro Flexible recurring tasks
Recurring tasks are simple to set, and can be created according to custom rules.
Pro Can set duration of a task
You can set starting and ending date and time for tasks.

Pro Share task lists for collaboration
You can share a list through an email or a shareable link.
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 Description and checklist all together
Paid users can add description and checklist into a single task all together.
Pro Customizeable Android widget
You can change the opacity, themes, lists, and cosmetic features of the widget.
Pro Siri integration
You can add tasks via Siri.
Pro Custom themes for pro users
Paid users can enjoy pro themes.
Pro Smart List
Allows you to set custom filters, making it easier to find tasks.
Pro Support team is great
Support team responds quickly.
Pro Great support to recurring tasks
Easy to set recurring tasks and a lot of possibilities to do that.
Pro Multiple reminders
Supports up to 5 reminders per task.
Pro Keyboard shortcuts
TickTick supports keyboard shortcuts that makes it easier to work with.
Pro Set list color
You can set a different color for each list.
Pro Print tasks
Easy to print any task you want to.
Pro Recover from trash
Easy to see and recover tasks from trash if you deleted them by accident.
Pro Integration with calendars by URL
Shows your events on other calendars (like Outlook) in your task list.
Pro Folder with concluded tasks
Easy to see all concluded tasks by date of conclusion.
Pro Separate networks and projects
This helps separate personal tasks from work tasks and makes it easy to differentiate between projects/contexts.
Pro Free plan is feature-rich
The free version includes lots of features other services charge for (attached files and more).
Pro Multiple reminders per task
You can set a single task to have more than one reminder.
Pro Simple access to almost any desired feature
It doesn’t take many clicks to access all of the features.
Pro Designed to work in team
Tasks can be assigned to specific individuals, or you can add followers. All people involved will receive notifications. The project can be shared with the full company or within selected subgroups.
Pro Real-time and custom push reminders
Some apps (Basecamp, Asana) don't have this.
Pro Apps for every platform
There are dedicated apps for almost every platform.
Cons
Con Free version is limited
TickTick's free version is limited to 19 task lists, 1 attachment per day, and 1 collaborator.
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 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 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.