"Humdinger"I follow airgun compressors closely and feel there is a 3rd. option you would be wise to consider. It is a Carette 4500 which will be available very soon from a well known U.S. dealer. An Omega is more expensive than the Carette, fills slower, and relies on rubber o-ring seals which wear out and are difficult tor a typical home user to replace on his own. In essence the Omega is a mechanized hand pump with lots of sophisticated bells and whistles.
The Air Venturi is suspiciously similar in design and function to the much maligned compressor from Mrodair that has proven to be a lemon. The Air Venturi is loud, over revved in order to reach its output, and shares its base design with the lemon from Arkansas being dumped at fire sale discounts. The distributors who sell the Air Venturi unit and the Omega have previously marketed other compressor types and dropped them when they became headaches to service. Once the warranty period is over you are on your own if better designs replace these units.
A knowledgeable compressor owner and forum member, Guykuo tested and vetted the Carette unit and it proved to be a well executed design at an affordable price. It is not overdriven, it does not rely upon rubber o-ring seals which wear out and are difficult to replace, and it meets the airgunners' need for value and durability. I have one on order and look forward to reporting my experience with it. Given the choice between the two you mentioned vs. a Carette, the choice is a no brainer.