dont buy either one...
after you pay the cost of the skimmer body and correct pump to drive the beckett you could have paid for a skimmer that is twice the power at about 1/4-1/3 the watts.
when overdriven, a beckett skimmer is only going to get like 40-45 scfh for each injector, and it'll take more than 100 watts of pump to get the 1200-1500 gph per injector you'll need to to power that skimmer appropriately.
this skimmer is as powerful as a double beckett injection skimmer, produces vastly smaller bubbles, and has much more dwell time in the skimmer body than any double beckett, not to mention no jet engine noise to deal with either...:idea:
http://www.shop.reeffiltration.com/product.sc?categoryId=2&productId=22
so, with this skimmer 42 watts gets you 2800lph air injection, it has a bubble plate to diffuse turbulence, submerged wedge outlet for easy adjustment/quiet water return, and a nice muffler to stop the air sucking noise, super quiet for the power...
by far the best bang for your buck, unless you want an ATB or BK for over a grand...