When comparing KVIrc vs CIRC, the Slant community recommends KVIrc for most people. In the question“What are the best IRC clients for Windows?” KVIrc is ranked 6th while CIRC is ranked 26th. The most important reason people chose KVIrc is:
Help files and online resources show all of the feature and scripting capabilities.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Extensive documentation available
Help files and online resources show all of the feature and scripting capabilities.
Pro Portable
KVIrc does not need to be installed. It can be kept on a flash drive and run from there.
Pro Still active developement
Despite whats been said, development has been continuing at a steady pace on version 4.3.1 and more recently 4.3.2.
Pro Plenty of customization options
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.