Hi guys. I have both Satsuma and Mariposa fruiting in my orchard for over 6-8 years.
I agree that you can say that my climate is suitable because it resembles the California climate, etc…
I say only one thing
Satsuma variety is a plum “chestnut” (absolutely mediocre from my point of view).
Their improved variety Mariposa, is a true plum wonder (in every way).
This is my opinion after harvesting both varieties for several years.
Mariposa is a marvel and Satsuma is a variety of the heap.
Of course , I admit all the criticisms .
But my experience in my orchard makes me say this.
Regards
Jose