When comparing Toodledo vs Doit.im, the Slant community recommends Toodledo for most people. In the question“What are the best cross-platform task apps?” Toodledo is ranked 23rd while Doit.im is ranked 43rd. The most important reason people chose Toodledo is:
It's possible to create a to-do item by sending or forwarding an email.
Specs
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Pros

Pro Can create to-do items via email
It's possible to create a to-do item by sending or forwarding an email.
Pro Decent filtering and sorting
Pro Priority organizing
Pro Great GTD implementation
The GTD principles are very perfectly supported by Toodledo.
Pro Functionality-rich
Integrated sharing, note taking, habit tracking, and outlining make this a more powerful tool than a simple list of to-dos.
Pro Upload From CSV
Quickly upload an excel (CSV) file template of tasks to a folder for complex but repeating projects.
Pro Well documented, free-to-use JSON API
If you adopt Toodledo as your productivity system, you can be confident that you can extend it to fit your needs with this programmatic access.
Pro Can tag items
Pro Space to add lengthy text
Notes area that can then be hidden.

Pro Sends a daily email reminder
Toodledo reminds you via email of the tasks on your plate for the day.
Pro Apple Watch support
Integrated support for Apple Watch lets you check on your to-dos on the run.
Pro Clean, simple layout
The apps borrows some design elements from Material Design-type design, which uses a slide-out menu. Everything is laid out in an easy-to-find manner.
Pro Daily review which allows for did-take VS should-take time comparison
A built-in daily and weekly review function that lets you compare the estimated time for tasks against the actual time they took, as well as productivity for the day/week.
Pro Low cost
Subscription value is generally lower than other platforms.
Pro Quick add from notifications
Pro Free apps for Android, iOS, Web.
Cons
Con Free version limited to 20 folders
Con Android app has annoying notifications
Whenever the app fails a background sync action for any reason (server issues, lack of internet connection, etc.), a notification appears.
Con Good as a starting point
Toodledo is a good starting point, but is essentially the same as an Excel spreadsheet where you have to build your workflow via the saved searches.
Con Support non existing
Con iOS version no longer being updated
iPad upgrades stopped at iOS version 11, so if you want to keep Doit.im it is not possible to upgrade to iOS12. As there is no export facility, you are stuck.
Con Rarely updated
Con Offline sometimes
Con Nonexport and support desk say they will never include it (your data is theirs now)
Con Subscription based
While not expensive, it does cost money to get it for Mac or Windows (although you can view it in the browser for free). The subscription also adds automatic cloud sync, sync with Google calendar, adding tasks via email, manual sort, attaching Evernote into tasks, and more.
The subscription costs $2/month, or $20/year which is very reasonable
Con Sometimes it doesn't see your active subscription
Con Rip off
Con Not very customizable
There is no way for you to create your own "perspective".
