When comparing CIRC vs Trillian, the Slant community recommends Trillian for most people. In the question“What are the best IRC clients for Windows?” Trillian is ranked 22nd while CIRC is ranked 26th. The most important reason people chose Trillian is:
You can set up a dedicated server to hold your communications. Great for businesses that want to build their own infrastructure.
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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 In-house server support
You can set up a dedicated server to hold your communications. Great for businesses that want to build their own infrastructure.
Pro Multiple networks in one place
Among them Yahoo!, Facebook, Skype, Google, AIM, ICQ, XMPP, MSN. You can have multiple accounts associated with each service.
Pro Group chat
Trillian to Trillian group chat is available.