Pete, I can speak on Celeste JW. I have that one. It's a tough tree and puts on a lot of figs. Mine is about 6 yrs old now and one of my best Celeste. It is a true Celeste but does not drop figs like some others. I think you will enjoy it.
I also have an "Improved Celeste Not!". I forget who I bought it from but it too has some amazing figs. If you got the room, get yourself an Improved Celeste. Just one bite and you will look for more on the tree!
Today, I have 3 planted in my orchard. To me, they are that good!
I never hear of Union Berry and Bonita Verte. Looking forward to more information on those 2. I'm planning a drive to Chapel Hill this summer. I'll ping you before I come. I'll bring you a surprise.