When comparing CIRC vs Nettalk, the Slant community recommends Nettalk for most people. In the question“What are the best IRC clients for Windows?” Nettalk is ranked 14th while CIRC is ranked 26th. The most important reason people chose Nettalk is:
Nettalk can be set up to overlay incoming messages. Especially useful for games.
Specs
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Pros
Pro "One Identity" ability
Create a personal "bouncer" of sorts, using CIRC "/make-server" (/help make-server for more details) give you a connection so that you can using the same Ident/Nick from multiple devices.
Pro Mobile
Access it everywhere where Chrome is.
Pro Easy setup
Few clicks to install.
Pro Can overlay incoming messages
Nettalk can be set up to overlay incoming messages. Especially useful for games.
Pro Built-in spellcheck
Pro Free and open source
Pro Multi-lingual interface
Nettalk is available in English, Spanish, Dutch, Russian, Chinese, Hungarian and German.
Pro Easy interface
Simple and good looking interface.
Pro Encryption support
Pro Scriptable
Pro Functionality can be extended via plugins
Cons
Con No longer developed
Development ceased some time ago (2012).
Con Poor log management
It stores all logs in one file in a custom format.
Con German language
Is primarily a German language client, so the spell check, etc. is in German.