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There's no inherit advantage (other than people not thinking you're walking around with a dildo in your mouth, which is an advantage not to be underestimated), they're just build as a box instead of a cylinder. They tend to be more stable, if you have a heavy tank. Some have interesting features because there's more space; the Reos are neat, though also way overpriced. I wouldn't buy one, but they're neat. There's a difference between egos and the disposables you find at the gas station, and between VV and non-VV (but VV egos do the job fine), but I don't think there's much functional difference beyond that. I think it's like pipes and bongs, it's really mostly aesthetic but people feel strongly about their choices.