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I've shot all 3 of those brands, but don't own any of them. I've always had a less than stellar vibe about DPMS quality - but nothing on which to base that, just a feeling based on Internet reputation and a few parts that seem "cheap" in the hands.

Del-Ton is impressively robust from the outside - no idea on internals.

S&W is run of the mill, solid, average, no frills.

Decide configuration you want and pick the brand that has that configuration available.

Buddy of mine who owns the Del Ton chose it over S&W because the Del Ton was available with mid length gas system.