When comparing Snowball vs Miranda, the Slant community recommends Miranda for most people. In the question“What are the best unified messenger apps?” Miranda is ranked 8th while Snowball is ranked 9th. 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 Extensive client support
Snowball supports Facebook Messenger, WhatsApp, Snapchat, SMS, Hangouts, Twitter, Line, WeChat, Slack, Telegram, Viber, Hike, BBM, Kik, GroupMe, Kakao and Skype.
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 Not standalone
Snowball requires (some of) the original apps to be installed. This also affects resource usage as the app uses ram for itself plus the ram used by the other apps.
Con Outdated XMPP Support
Missing OMEMO, Carbon Copy, HTTP-Upload ...