LOL you're over thinking this big time. Not many buy the Gorilla tent because it's over priced and the SJ tent is comparable. Gorilla maybe a better tent on paper, but it's like paying $300-$400 dollars extra for a tent that can hold 500lbs instead of buying a tent that is just as good, but can only hold 400lb when realistically, you'll never ever need to hold more than 200lb max if that. The 2 best tents on the market are SJ and Gorilla. Also, no tent is going to be all that air tight, and you do not want one to be air tight. You want fresh air to be able to be pulled into the room at the very same time that your hot, carbon scrubbed, C02 depleted air is pulled air out of the room. This will create a suction within the tent that will keep odor from escaping, i.e., airs pulled in and not escaping out.. If you have an air tight tent, you'll not only create a vacuum effect (like air leaving a balloon), but you'll suffocate your plants as well (unless you plan on buying a C02 filter). No matter what, there will be some odor, but as long as you're using a Carbon Filter and Inline Fan to pull air out of the room, you do not have to worry about any overwhelming odors... You seem to be leaning towards the Gorilla tent, so why not get that one? You can't go wrong with either...