I agree that built-in spacers are better than the rings.
Of those 3 brands, I'd probably choose Megan. I had a set of their TC Rods, and the joints on them were perfect even after 5 years of dailying and tracking. So I'd assume the joint on their inner (only part that can really wear out) is of the same quality.
Have you considered a bolt-on rack spacer? That would give you the extra travel without sacrificing thread engagement. I ran one for that exact reason before upgrading to knuckles.
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