When comparing Seamonkey vs Falkon, the Slant community recommends Falkon for most people. In the question“What are the best web browsers for UNIX-like systems?” Falkon is ranked 6th while Seamonkey is ranked 18th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Not just an e-mail client
Seamonkey is more than just an e-mail client as it is a full featured web browser as well. This makes for a good app to use for those that dislike having many different apps on their devices as it is a bit like an all in one solution.
Pro Auto imports setting from Thunderbird
For those that would be making the switch from the Thunderbird e-mail client setup is quite easy with Seamonkey as it auto imports all previous Thunderbird settings.
Pro Developed by KDE
Pro Lightweight
Pro Free and Open Source
GPLv3 license.
Cons
Con Permanent CPU usage
Seamonkey permanently uses CPU (quite a few percents on a Intel i7). On a laptop this causes the fan to run (which make noise) and the battery to lasts less time.
Con Weak multimedia support
It has some issues with multimedia content eg. Non-playing videos on webpages.
Con Now under the KDE umbrella
Qupzilla is now discontinued and renamed to Falkon. It will also now be a part of KDE and will probably need more dependencies like kde-frameworks in the future.
Con Linux-only
Con Bookmark management not the strongest part
It often requires quite a lot of clicks to add and remove bookmarks.