When comparing Ideone vs Floobits, the Slant community recommends Floobits for most people. In the question“What are the best online collaborative programming editors?” Floobits is ranked 8th while Ideone is ranked 10th. The most important reason people chose Floobits is:
Floobits doesn't force a new text editor, it integrates with existing text editors such as Emacs, Vim and Sublime Text.
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Pros
Pro Can execute code against custom input
Pro Supports many languages
Supports languages missing in other similar systems. For example Groovy, Objective-C, SQLite, etc. Shows specific version it supports.
Pro Integrates with your text editors
Floobits doesn't force a new text editor, it integrates with existing text editors such as Emacs, Vim and Sublime Text.
Pro Video conferencing support
Floobits integrates with Google Hangouts to provide voice and video chat.
Pro Share terminal
Pro No editor
You can sync a Floobits workspace without a editor using a command line tool.
Cons
Con Supports relatively old versions of the languages
For example now after Kotlin 1.3.10 is released it still offers only 1.0.6
Latest Groovy 3.4, but they support only 2.4.7
etc.
Con Limited number of supported editors
Floobits only supports a subset of IDEs and editors available. If you or the people you intend to work with don't use the supported editors, someone needs to switch their preferred environment to use the service.