When comparing Trillian vs Gajim, the Slant community recommends Gajim for most people. In the question“What are the best XMPP clients for Windows?” Gajim is ranked 3rd while Trillian is ranked 6th.
Ranked in these QuestionsQuestion Ranking
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.
Pro OMEMO encryption available as a plug-in
Con Supports all dead services.
Con Chat logs are in SQLite DB.
Plaintext (or XML/markup) logs are not available.
Con OMEMO not natively supported
Con Chat logging enabled by default
Problematic for encrypted chats.