Moog or TRW   ,  I wouldn't use anything else.  
Are they worth it ?   ,    yup  ,  they last waaaayyyy longer than the cheapo parts.
Same thing with unit bearings  , SKF only 
I used to be a fleet mechanic /  manager  , the trucks we owned and serviced were driven hard in adverse conditions , some of them chained up for months at a time . Moogs ball joints only on those trucks , nothing else would last.