The backstory on my OS tree (or trees I guess) -- I purchased several dozen OS mangoes from Walter Zill back in 2013 / 2014 (can't remember which year) and planted all of the seeds. From the dozens of sprouts, I selected the 2 that were most identical to the mother tree, both in terms of leaf appearance and sap smell (OS is polyembryonic, so the odds were high of finding a match).
When the seedlings were just a foot tall, I grafted them to a mature glenn that I had recently cut way back. Within 3 years, both flowered and fruited, producing a fruit identical to the mother tree. Both are identical in appearance, flavor, and habit to one another, giving me high confidence that both are indeed clones of the mother tree.
Both have been extremely vigorous -- laughably vigorous -- sending out telephone pole shoots that grow to 10 feet long in a single season (some of which flop over due to the weight).
Fruit set and retention is extremely good (5 - 6 fruits per panicle). However, only small portions of the canopy tend to flower, probably due to the vigor.
I think part of the issue is that the scions were grafted to a glenn that had been cut back quite heavily. Both sides seem to be calming down a bit, so I'm hopeful that next season I'll see more bloom.
Walter's tree, also a topwork onto a mature tree, was huge the last time I saw it. I know there have been reports of the growth being manageable, but perhaps that's only the case in the juvenile period of the tree's life?
That said, my favorite is still lemon zest :-).
That's what I do.
I'd LOVE to plant both... as well as about 30 other varieties!!!
But I was hoping to pare that 30 down to less than a dozen.
You could always multi-graft and then prune off the limbs of the less desired ones.
Jeff, how productive is your OS? I am thinking of topworking part of my LM into OS. Compatible in terms of vigor and productivity?