Haven't used the Waring but have used the NS, which I thought it was overpriced and not very well built. We're currently using a Star GX14IG 14"x 10" Grill Express everyday for 10hr for 3 years. I like single better than dual, just seems to have more usable grill space and only needs 120v. I figure I could always add another grill if I needed more capacity but I haven't had to. Make sure and get raised grill on both top & bottom, leaves nice grill marks and you won't be grilling meat on it anyways unless you want your veggie/vegans to freak out.
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