YunoHost and WikiSuite have some similarities. This page is to explain the differences and rationale of choices. You likely will be interested in the other alternatives to WikiSuite.
YunoHost is more about helping self-host a large number of apps while WikiSuite is about offering you an integrated solution (which you can self-host). In this, YunoHost is more an alternative to Virtualmin. See also Virtualmin vs YunoHost.