I want to know from scripture or from saints why **Vidvat Sannyasa** (sannyasa taken after self-realization) is considered superior to **Vividhisha Sannyasa** (sannyasa taken with the desire to gain knowledge related to Brahman)?

I also want to know some names from the *Itihasas* who took Vidvat Sannyasa.

For example- Sage Yajnavalkya.