Technically, I think the BCV studio is smaller in total square footage than a BC standard room. Something like 356 sq. ft. to almost 400 sq. ft. Somewhere in there. But I think spicey cat is right.. the studio "feels" bigger. Also, if you love balconies the BV is the way to go. At the BC, some rooms have little balconies that you can only stand on -- no table and chairs so you have to specially request the full balcony if you want it. At the BCV, all rooms have full balconies or patios (or at least I've never seen a room that didn't).
But we like the BCV studio for one reason over the standard room: the mini kitchen. We like to eat breakfast and quick dinners in the room, and eat out our big meal out at lunch. The mini kitchen makes this possible, without the aggravation of having to tote a cooler and hope that it's cold enough, keep it filled with ice, etc., etc. And with the microwave and toaster, we have more food options available to us. The studios (as you noticed) are priced the same as the standard rooms, and the money we save on food costs by using the studio means that we feel like we come out ahead. But it's a personal preference.