So I’ve got both of these on hand and I’d say from a very limited time playing around with them that the penguins are the better option.
Both switches have some pinging (at least stock) but I suspect that can mostly be cleaned up with some spring swapping and lube work (on both).
The Dragonfruit sounds a little higher in pitch than the Penguin on bottom-out and a little lower on the upstroke; the Penguin’s UHMWPE + Nylon bottom seems to be doing the work we expect Nylon to do and its UHMWPE + PC top seems to be doing the work we expect PC to do.
The Dragonfruit seems a tiiiiiny bit smoother stock than the Penguin but frankly they’re both UHMWPE-blend housings that will feel nice and smooth with a little lube so I don’t particularly think it matters that one is minorly smoother than the other out of the box (at least not for anybody who’s going to read my blathering). This could also just be due to differences in factory lube application, or that I’ve opened the Penguin switch before!
The stems appear to be nearly identical, which is actually a little bit odd considering they have mold markings in completely different spots.
(in both photos, left is Penguin, right is Dragonfruit)
But, as @pixelpusher mentions: boy howdy those Dragonfruit wobble. The N/S wobble of both is fairly expected, but the E/W wobble on the Dragonfruits is notably higher than that of the Penguin (which is almost as good as I’ve seen in a stock switch on this metric).
The housing is a real nice color on the Dragonfruits, though, and if the leaf ping is mitigable I could see it being a great frankenswitch housing.