I don’t use anything but my navel orange, satsuma, yosemite gold, kishu mandarin are all seedless, and I have had them for many years. Dancy and honey mandarin have seeds but not many. The ones I bought the last two years are seedless, but I don’t count those at least for a few more years, because I am not sure what they did at the nursery.
My sisters and I stopped buying clementines more than five years ago because they are not sweet as before. When they are in season I would only buy the grapefruits from Cal Poly Pomona farm store, and no they don’t sell jujube fruits, just the Li and Lang trees. The Oro Blanco type is seedless but the Frua is full of seeds. They are very sweet if I let them ripen on the counter. They are grown on campus.