Your question threw me off you asked which is your favorite supergroup and i only see,Blind Faith, Crosby Stills Nash and Young, the Raveling Wilburys, cause the term supergroup is taken when memebers of other big time groups get together and form a band. which the 3 abovedid. The Other groups are very good but not classified as supergroups.
but to answer your question: Cream-Spoonful, Blind Faith-Do What You Like, Crosby,Stills, Nash& young-Suite Judy Blue Eyes, Emerson Lake & Palmer-Lucky Man, The Firm-All The Kings Horses, Power Station-Communication, Traveling Wilburys-Handle With Care, Asia-Heat of the Moment, Velvet Revolver-Slither, Damn Yankees-Coming Of Age, Audioslave-Cochise.
I'm wrong Emerson, Lake & Palmer are also a supergroup. Firm not really.
There are many other supergroups out there.
Thanks good question. Have a goodday