When comparing On{x} vs Automagic, the Slant community recommends Automagic for most people. In the question“What are the best Android apps for making your phone automatically perform certain actions based on set criteria?” Automagic is ranked 8th while On{x} is ranked 10th.
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Pros
Pro Access to scripts
On{x} users have access to a whole database of specialized scripts that can be edited or used as they are.
Pro Program remotely
Instead of having to edit code directly from your phone, code is edited through Microsoft's onx.ms website.
Pro Detects speed and acts accordingly
This app tracks users by GPS and knows if they are sitting still, walking, running, or driving. This functionality can be used to trigger actions when a certain pace is achieved, such as "Play music when I start running."
The GPS integration can also be useful for triggering actions when a user leaves or arrives at a location. Popular recipes that use the GPS function are "Remind me to work out if I haven't been to the gym in 3 days" or "Text my boyfriend when I leave work".
Pro Live view of executing flows
Pro Flows can be defined graphically like a flowchart
Pro Easy
It's easier than Tasker to me.
Pro Plug in
It supports all the plug in which supports Tasker.
Pro Better programming
Some flows work better than Tasker. In fact, some tests that often don't in Tasker do so easily in Automagic.
Pro Less or no dependency
It doesn't need an app like 'auto voice' or something like this of Tasker app.
Pro Scripting language is superior
This app has a much more intuitive scripting language with tons of snippets and function examples. More powerful, elegant, flexible, and seems less resource intense.
Cons
Con Project seems to be dead
There are several forum posts on their website inquiring if the project is still being developed, and there do not appear to be any responses from developers. To add to this, the last update for this app was in February of 2014
Con Forced Facebook login
Although all the recipes can be seen and used without Facebook login, many users find Facebook integration unnecessary.
Con Bad for battery life
The GPS tracking is horrible for battery life, but other variables might make this con bearable.
Con Bare
While this app is incredibly useful, not much emphasis is put on making the UI pretty. This in no way effects the functionality of the app, but some users might find the basic interface unappealing.
Con You are forced to draw out flow diagrams
Pretty, but at the end of the day a pain to maintain diagram readability AND logic.
Con Not popular
It's not as popular as Tasker.