That is a tough question. I have had my WC pair of Dovii for almost a year, they are about 2 years old now. My male is easily 15"+ and my female is a beast, coming in around 11". Their personality and interaction is awesome. My male gets more blue everyday. No attacking me when I clean, they just go hang out in the corner.
I also have a pair of Umbee. Male is about 10" and female 6". Both are barely a year old, and only the male comes out to see me when I come around. I had him in the same tank with 5 females and he chose this one. She is a beaut. He too gets even more blue as he gets larger. He is currently in a tank in my fish room, while my Dovii gets to hang out in the living room. But hopefully soon, I will get the Dovii into an even larger tank in the living room, and put the Umbee in the Dovii old tank. Have them side by side so that they see each other.
Sorry I kinda wandered there. For me right now, I would say Dovii. But who knows, once my Umbee hits 2 years and 15"+, I may be changing my mind. Both of my pairs are friendly, they dont attack me when cleaning, and they are very personable.
I definitely choose either one over my Festae pair any day of the week.