When comparing Quassel vs Linkinus 2, the Slant community recommends Linkinus 2 for most people. In the question“What are the best IRC clients for Mac?” Linkinus 2 is ranked 5th while Quassel is ranked 7th. The most important reason people chose Linkinus 2 is:
With the new version release, Linkinus 2 is up to 10 times faster. It also has new core features such as auto reconnect, proxy support and much more.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free and open source
Quassal is available for free with source code licensed under GPL and available here.
Pro Distributed
It's possible for a front-end client or multiple front-end clients to connect to a single core client. This allows setting up an always on-line core that can be accessed from anywhere.
Pro Easy installation on Ubuntu due to the existence of PPA's
Right now Quassel has a PPA maintainer, which allows you to install the stable version or daily versions.
Support for PostgreSQL as database backend and easy to configure for people that know a bit about systems.
Pro Major improvements over first version
With the new version release, Linkinus 2 is up to 10 times faster. It also has new core features such as auto reconnect, proxy support and much more.
Pro Searchable logs
Linkinus 2 lets you search chat logs by keyword within the app. You can also enable or disable logging on a per-channel basis.
Pro An extensive feature set
For those looking for a feature packed client, Linkinus 2 is for you. The $8 USD price point is almost justifiable by the feature list. It frovides features not seen in other IRC clients such as embedded media(Youtube, Vimeo, etc.) and can automatically expand shortened URLs.
Cons
Con Potential memory bloat in monolithic client if left running for a period of time
(I don't know if this problem has been fixed in recent years, but I have doubts)
Con No DCC support
DCC or Direct Client-to-Client protocol allows for private communications between users (without the traffic being routed through servers). Neither chat nor file transfers are supported.
Con Abandonware
Con More expensive than most IRC clients
At $7.99 USD on the App Store, Linkinus 2 is more expensive than most IRC clients. While the extensive features may justify the price for some, basic users probably do not need to pay for a commercial client.
Con No Notification Center support.
Linkinus 2 does not support OSX's Notification Center meaning you'll have to keep an eye on the window as you won't be getting alerts straight to your desktop.