The Supreme Lord is One or many? What is the difference between Vishishta Advaitha and Sankaracharya Advaita phylosophy?

Vaishnava  phylosophy also say Parabrahmam is one. But one in the sense. Variegated one. For example..  on 1 point we can say our hand is one. But our hand consists of different fingers(variety) but our hand is still one.

Similarly there is noone else(no second person nor anything) who/which is a match to the Supreme Personality of Godhead's Opulence, beauty, shakthi, Virya, tejas, gambhiryam, vatsalyam, madhuryam, his divine abode(Vaikuntham) etc, his wonderful associated, his eternal consorts etc..

'Na tad samastha abhyadhigachathi drshyathi(Upanishads)".

"Eko vai narayana aseed na brahma na esa nah| ne me dyava prthi na nakshathrani|(upanishads)"

"Narayana paro jyothi atma narayana parah:| narayana parah brahma tattvam narayana parah:"(Upanishads)

...etc

SO we also say everything is one. But there is a difference unlike the oneness concept of the  Mayavada phylosophy of Sankaracharya.