If you decide not to go with a Beckett or Downdraft, then really I wouldn't lose too much sleep on the decision regarding a venturi skimmer.
They all do about an equal job with similar problems. Cone or cylinder, needle or mesh, it's not worth the time spent considering.
If not status-hungry (ATB, Bubble King), find the one that is best price-to-money. My $.02 here, but really, you will get about the same results whether you go SWC, Octopus, WM or Bubble Magus, or any of the other brands producing essentially the same design. Even the pumps have quite similar specs.
For the most consistent and productive skimming, none of these compare to a good beckett/downdraft. They'll skim well, don't get me wrong. But in terms of skimmate production, in terms of stability, in terms of oxygenation, not as much.
But you need a pressure rated pump, so venturi skimmers are far less costly to run.