Brian - Hammer To Fall, The Show Must Go On, Save Me
Roger - Radio Gaga (a good song that I just don't listen to anymore)
Freddie - It's got to be BoRhap
John - You And I
Freddie:Far too many but I say BoRhap + Y.T.M.B.A
Brian:Quite a great deal but I say W.W.R.Y + H.To.F
Roger:A decent amount I say A.K.O.M + Radio Ga Ga
John:Not a lot but I say A.B.T.D + Cool Cat.
Freddie - Somebody To Love/Bohemian Rhapsody/CLTCL/In The Lap Of The Gods...Revisited (and more)
Brian - TSMGO/Save Me/Tie Your Mother Down/WWRY
Roger - Radio Ga Ga/Heaven For Everyone/Breakthru
John - You're My Best Friend/Spread Your Wings/AOBTD/IWTBF
This is one question I truly can't answer because I consider all Queen songs great! I can say "this one's best" then change my mind in a nanosecond. I even like all songs on Hot Space...but it took a while to appreciate them!
The best imo: Bo Rhap. Overall. Now, with individual members:
Fred - Black Queen
Brian - Teo Torriate / Father To Son
Rog - Don't Lose Your Head
John - You And I
My favourite, overall: '39. Each member's (without counting that):
Fred - Was It All Worth It
Brian - Scandal (though that may change tomorrow)
Roger - Ride The Wild Wind / Action
John - If You Can'T Beat Them / My Life Has Been Saved
Not counting solo projects of course...
Freddie: Bohemian Rhapsody, Made In Heaven, Don't Stop Me Now
Brian: Who Wants To Live Forever, Too Much Love Will Kill You, The Show Must Go On
Roger: TATDOOL, Drowse
John: You're My Best Friend, AOBTD