When comparing Trillian vs Miranda, the Slant community recommends Miranda for most people. In the question“What are the best XMPP clients for Windows?” Miranda is ranked 1st while Trillian is ranked 8th. The most important reason people chose Miranda is:
Very light on system resources and extremely fast, Miranda IM requires no installation and can be made to fit on a single floppy disk or USB drive.
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Pros
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 Requires no installation and is very lightweight
Very light on system resources and extremely fast, Miranda IM requires no installation and can be made to fit on a single floppy disk or USB drive.
Pro Insanely customisable
You can see all the plugins available for Miranda here.
Cons
Con Supports all dead services.
Con Outdated XMPP Support
Missing OMEMO, Carbon Copy, HTTP-Upload ...