Several of the fig collectors on YouTube report that their BM plants from UC Davis grew much more slowly than those from KK. Using the search function, I found only one post on the forum that addressed this difference, which was attributed to FMV rather than any genetic variation. 

Is there a reason to reason to prefer BM plants originating from the KK stock over plants originating from the UCD stock?

Scott

Yes there is a reason for preference, UC Davis Black Madeira literally grows like a snail, and takes forever to fruit, my KK black Madeira is so vigorous I have to cull some of the fruits, if u have a choice and u want to eat fruit then go for KK's Madeira it is far superior in my opinion! And worth every penny! Also Figo Preto is an option as well!

Should I be suspicious of an eBay seller who sells both from time to time but claims his UCD stock is equally vigorous?

just go over to Justin's house and take his :)

Unfortunately there are neither any KK Black Madeiras or any Figo Pretos on eBay at the moment. I guess I'll just have to wait. 

KK also has a Madeira Island fig, or is the BM you're referring to? Sny comments welcome.

Scott, talk to tyro - he can help with your request. Do a search for his name and PM him.

Forgot to mention, he has black Madeira, preto and I-258.

I talked to him. He's all out of KK BM. Do you know anyone else who might have some?

I thought I read KK's Black Madeira came from UCD and that his strain was propagated from a healthy branch thus giving rise to a healthier strain.  Perhaps one could call it a "sport" of UCD Black Madeira?

That's my understanding of the kk also Rewton. I have the kk version for a couple months now and it's starting to finally bud out new leaves. FMV is not prevalent on my plant but it's definitely a slow grower for me.

Scott not to steer away from the black Madeira, but have you looked around for the figo preto? Too me they are very similar, some here consider it the same. I have both can't tell the difference right now. Seems to me that black Madeira is selling like hot cakes.

Heres a pic of my ucd black madeira.It was grafted in
Feb of this year.Its 30" of growth in 6 months.Im pleased
with it.I bought the cuttings from drivewayfarmer.

I suspect my UCD Black Madeira might be the origin of kk's trees as we traded at one point. This tree and 3 others were grown from one 8 inch cutting from UCD. Three of the trees were very vigorous and fast growing and did not exhibit overt FMV. This tree has been potted since 2008 and is a dependable bearer of about 30-40 figs.  

Not really sure why its cuttings are so expensive, I got a Black Madeira plants with few bucks few months ago , It was very small with shocking amount of FMV mites on leaves , I sprayed them with pesticide and they dropped all its leaves,  I cut them down to base, one dead, Another one grows a new branch with very fast growing speed without FMV leaves. not really sure that it worth to keep it or not.

I have several strains of Black Madeiras.
The Black Madeira from UCD (so far) bears smaller figs than the Preto.
They are not the same as far as growth habit is concerned.
The Black Madeira UCD will eventually shake off its FMV symptoms but needs lots of sun and heat, but is a slower grower than the Preto or the larger Black Madeira.
If you are in Zone 8b and above, any black Madeira will ripen its fruit, but might be vulnerable to winter freezes. If in ground it will take several years to get established. I leave mine unprotected in winter and lose lots of wood each season. This past winter, both the Preto and Black Madeira UCD died to the ground but came back nicely.
Being in different soil, it's hard to compare the two, but the Preto as of yesterday already grew 5ft 5" from soil level, while the Black Madeira's all new highest shoot, grew about 2ft 3".
Today, I could count 10 figs on my small Black Madeira tree, while the Preto has only a couple, and busy getting taller.
As far as flavor is concerned, it is difficult to compare the two young trees, as they are awefully close.

I am looking for a Figo Preto as well. I asked only about the BM because it didn't seem like there is any disagreement regarding various stock for the Preto as there is for the BM. If anyone has Preto plants for sale, PM me. 

My (UCD origin) Black Madeiras from November Pluse one CDD noir.    

Wow!looks very nice and something to look forward to.
Thanks for posting.

So jealous! Pictures look awesome Scott.