I prefer
Zoe to
Chloe just because I prefer the way
Zoe sounds.
Chloe is still more common. Out of the spellings you've listed,
Zoe and
Chloe are the most popular.
I'm not sure if
Phoebe and
Xanthe will ever become as popular as
Zoe and
Chloe, but I'm guessing not.