When comparing Toodledo vs To Round, the Slant community recommends Toodledo for most people. In the question“What are the best cross-platform task apps?” Toodledo is ranked 23rd while To Round is ranked 57th. 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 Easy to use
The interface is clear and smooth.
Pro Unique and interesting design
The bubble design format is simple to understand visually and is effective in keeping track of ones to-do list.
Pro Gamification of tasks
To Round turns task-completion into a game-like experience, which is good for those who are motivated by this type of positive feedback. It can be a little distracting or annoying for users who want an even simpler process.
Pro Convenient widget
The app features an Android widget that you can place on your homescreen to view your current tasks even more quickly.
Pro Good reminder feature
You can enable push notifications that make sure you never forget a single task.
Pro Visualisation of tasks
The app uses bubbles to represent tasks. The bigger the bubble, the more important the task is.
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 No web-based access
The website demonstrates how the app works, but doesn't allow you to access any of your own to-dos.
Con No desktop app
So far no apps for desktops have been launched.
