On gods

 In hindu religion we have three gods brahma,vishnu,shiva who are creator,protector,
preservator,protector,destoryer.Since creation is accidental brahma is given a subordinate role.He is given the name of hiranya garbha from the upanishads which is the name of of Ishwara.Vishnu,Shiva are the main gods.Vishnu is the saguna brahman who is the preservator of the world,who establishes dharma,by avatars.Shiva the destoryer is niraguna brahman with saguna qulaities.He is not involved in the world that much.But only destroys living beings,world.It is this aspect of brahman which is superior.
Worshipping shiva can lead to nirguna brahman.Worshipping vishnu wont lead to nirguna brahman.
Thats why shiva's worship is said to be most auspicious.

Vishnu worships shiva becasue he cant kill anyone becasue he doesnt have destroyer powers.So to kill evil people he needs a weapon.So he worships shiva and gets the sudarshana chakra.