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Does anyone know how this compares to Armadillo Airspace's VTOL technology, and what Armadillo's long term strategy is for its technology?

Two totally different things. This is for recovery of their (SpaceX's) first stage rocket.

If both are using VTOL, one for a small object, one for a large, how is it all that different?

Because the design requirements and capabilities that result are entirely different.