I prefer Kira but Jadzia is still a firm favourite and a brilliant character in a very different way to Kira. She's the type of character you could only get in science-fiction but is also a very well developed character as a person.
Uhura in the reboot films is defined by her ability to take her top off or pull gooey faces whenever Spock is around whereas Jadzia, Kira and Ezri were very strong women not defined by their men.
I ordered the Lives of Dax novel off Amazon for a penny. Excited for it to arrive.