Anyone care to comment on this? BTW, apologies if this is a duplicate of a previous thread. I'm curious to know if which of the two delivers the quickest data or are they equal? My concern isn't so much about coverage areas/reliability -- as I live in and travel to excellent coverage areas for both carriers -- but it's more about what sort of performance I would see when I'm in an area in which I can send/receive data. Yes, the iPad 3G data plan with AT&T is markedly cheaper but again - I'm only curious from a performance point of view. Would I get wi-fi performance similar/equal to what I get from the wireless router in my home with their Mifi card?