So you just finished reading Reasons to use Foswiki and now you want some ranting? Then you are in the right place.
Top reasons to skip TWiki and upgrade to Foswiki
A single company called Twiki Inc. once took over control over the TWiki project 2008 after a decade of free software development and then claimed it as their own success. This company went out of business silently around 2012/2013.
TWiki is protected by a trademark, owned by a single person, not the community.
TWiki is ruled by a dictator while Foswiki is backed up by a democratically elected board of directors.
In 2008 this single person disabled the passwords of every community member and then demanded to sign a newly created code of conduct to opt in again. This isn't really a sign of trustworthiness.
After this incident all TWiki developers moved to Foswiki.
Former TWiki plugins are all continuously maintained on Foswiki.
Users commonly migrate to Foswiki instead of upgrading a TWiki installation.