LCA: the diff between stock and Maier is a plate welded to the bottoms to box them in. Otherwise they're stock, including the rubber bushing. They start with all new parts and that's why they're painted, not powdercoated, because you can't unbolt the ball joint from the lowers like with the uppers.
UCA: They start with a used arm, preferably a 4-bolt, and recondition with new ball joint, pivot, bushings and pivot nuts. The pivot nuts have 90 degree grease zerks. They're powder coated a medium gloss black. The big mod is that they weld boxing strips down each leg of the "A". This is something Opentracker does not do, because he wants a stock appearance. Maier doesn't do the center reinforcing plate like Opentracker and Cobra Automotive.
Also, there are two kinds of Maier UCA's, "re-aligned" and not. Re-aligned means to cut the ball joint pad and bend it down, so you can do a 1.5" - 1.75" Shelby drop without a Negative Wedge kit. Opentracker does this mod too.
Opentracker is also experimenting with spring perch relocation. Maier does not do this.
If you go tubular, go Total Control, because they use rod ends and Global West uses delrin bushings. Rod ends are better.
If you want to go cheap, recondition your stock UCA's (I've been reading too many bad things about new aftermarket units to trust them), run a 1" drop, and get the Opentracker rollerized spring perches and the Street or Track strut rods.