@Felipe
I have outlined the tastes in the individual listings pages. The Z Mauritiana "Round" would probably win a taste contest, followed by Spinosa varieties to which "Round" seems affiliated to
@nexxogen
I dont have any experience with them outside of subtropical climate. subtropical means very cold in winter and very hot in summer. Temperatures in subtropical India do not go below 0 celcius, and usually get to 2-5 celcius in winter. Ziziphus fruit in winter and mature by spring.