“Sundere sundero ram sundere sunderi katha
Sundere sunderi sita sundere Kim na sunderem”
This verse says most beautiful is Ram and Sita and their story
That’s why Sunderkand is very beautiful. This is a chapter in Ramadan
The real reason is Sunderkand has detailed yoga related instruction written in a very cryptic way.
Hanuman flies over the ocean, Pauses on mountain top, hits lankini, she throws up blood, and then Hanuman encounters ravana etc
It is an incredibly beautiful allegory. Hence beautiful
What more can I say ?
Oh btw, another beauty – it is story of creation Ram and Sita , a triangle of shree chakra