I don't want to start an argument but looking at all aspects of a Skimmer purchase based on my experience, these are the things to look at;
Top brands, IMO, Deltec, H & S, Euro-Reef. There are others more expensive but I have no experience or knowledge of how they work.
Customer Service/Support, Deltec= Excellent, Euro-Reef=Worse then poor, H & S never owned one
Price, Deltec and ER are about the same on same ability rated models, H & S is said to be same performance as Deltec but better build quality and cheaper.
Deltec invented the needle wheel and in my opinion engineers their skimmers to work as designed, a whole unit. Euro-Reef is constantly updating their skimmers with so called "Beta Models". Some would call this progress, but if you are the proud owner of a work in progress, customer support plays a big part.
As you can see I have a bad taste in my mouth from my ER experience, Euro-Reef used to have a forum on RC, the closed it several times and finally for good. Too many ER owners posting about poor performance and lack of customer support. You had to post on the ER Forum to get a satisfactory response. They say its better now, but I will never trust them again. I just put my ER up for sale here the other day, it would work on a 50, but I wont praise it up to sell it. ATR in Phoenix sell Deltec, talk to Skip (pyrrhus)about your needs, he'll set you right.