I forgot to mention... I play Georgia in Eb..
My favorite key for most old tunes... And most were in Eb originally. (Old Cape Cod...I wish you love... PS I love you...To each his own.... etc)
'Back in the day" with the band in NY, of course we played a lot of standards when we played weddings and yes, many of them were in Eb ... we had a medley we called the Eb medley - "Once In a While", "These Foolish Things", and "Where or When" ...
I always loved playing in the key of Eb ...
you play in the key that you sing in there are no rules, .....
no favorites, just what the right key for your vocal in that song is every time,..each song different, take the highest note in the song, hit it comfortably, that's your key,
..every singer/player knows that 101
... but as Donny says, for vocals you pick the key that suits your range for that song ...