Yes Moog is becoming an inferior part now. They are predominately produces in Mexico with a small portion coming in from China and an even smaller portion that's still produced on our shores. As far as XRF goes.......they are the best!
The designer and owner of the company was the lead designer for Dana/Spicer years ago. He was getting disgusted with the company's direction and the use of inferior materials and craftsmanship at Dana/Spicer that he broke away and started XRF Chassis. We had a sales rep come in and showed us cutaways of a Spicer ball joint, a Moog, and their own. You could just tell just by looking at the XRF that it is a superior ball joint. We also saw a video of a pull test between the three and the XRF took nearly 1.5X the amount of force to pull apart than the rest.
So the first XRF ball joints purchased went on a Toyota pre runner 2wd truck. We put two sets of moogs in it and within 3 months they were loose and rattling. We then put in a set XRF's on the third attempt and they are still in the truck til today and tight, 4 years later. I was so sold on them after that, that I purchased a complete set for my 71 Scamp. I will always use XRF when they are available for what I'm working on. Also they are made by our friendly, skillful, and smart neighbors to the north, Canada!