I will have to dig around for the tags, but the plant descriptions said the Korean cherry was the sweet one. I have one other. It is a bigger cherry but tart. It wasn’t one of the sweet Romance Series cherries.
I planted a very small Korean cherry plant and grows slowly. It’s about three feet tall and about three years old. It blooms a little early for this part of Missouri. I covered it a few times this year and last. It has been very healthy with no care.
Not sure if this is where is bought them, but this is a good company. https://onegreenworld.com/product/korean-bush-cherry-2/