While i am not a fan or either Julie or Juliette, most i have shared and talked with say the Juliette is extremely close to or even an almost an unnoticeable difference when compared to Julie grown here in Florida in terms of looks and taste. Tree is more vigorous and less prone to disease issues. From a decision and recommendation standpoint, go with Juliette over Julie.
When compared to St. Maui, you may want Sheehan and/or Alex to provide their opinion. You may also want to consider Buxton Spice.
Hmmm...
Rob, I bought a Julie maybe a year and a half a go as a 3 gallon...it flowered it's first year (last summer) but aborted its fruit that were relatively mature..or the Jays got them, can't remember.
I was always suspicious of this tree though, in that time frame it's now a 7x7 (with a bit of pruning done already to control it) vigorous but bushy beauty (it's half whiskey barrel potted by the way). Zero fungus or pest issues, and is going into full bloom as we speak. The fruit definitely looked like Julie in terms of shape and beak etc., but now I'm wondering if this may be Juliette, because this thing definitely loves to grow! Think it's possible there may have been a mix up?
anyway I should definitely get some fruit this year to try, so we'll see.