Someone more knowledgeable please correct me if I'm wrong, but am fairly certain the cromoly ball joints offered by ADD are actually Proforgeds units and the design, at least for the Gen 2 and MS versions, was fairly recently updated, within the past year or so, to include grease zerks.
I sent them an email at the end of Jan '19 after noticing variances in the images on different sites, some with and others without grease zerks:
My inquiry, 1/24/19:
Hello, I was wondering if you recently updated the design on ball joints 101-10281 & 101-10282 to make them greasable?
If so, when will the new versions be available to purchase?
Thanks.
Proforged's reply, 1/24/19:
Yes, both have gone to greasable design. Some of our retailers may still have the older version on the shelf.
Who do you plan to order from and we can let you know if it will drop ship from our warehouse.
Thanks for considering Proforged parts!
As to whether they're stronger, more durable, or a better value than the OEM units, I couldn't say, but is something I'd like to know myself; new balls joints are on my short list of purchases too.