I personally have tents. I have a 8'x8'x7', (2) 4'x4'x7', and a 2'x2'x4' tents. Personally I like the ease of the setup (just pop the tent up and hang your lights and exhaust and pretty much ready), and the options it gives me. I decided not to do my grows from seed to harvest in just one tent. Instead, I'm starting my seeds or clones in the 2'x2' and letting them have a month or more in there before I move to my 4'x4' tents to continue vegging, and finally the 8'x8' is going to be for flowering. Reason I did it this way is so I can hopefully have huge harvests about every 2 months. If you do an entire room you don't have the versatility to change things around too much. Also, you can monitor the environment and make each tent different if needs be (more or less humidity for example). I'm still fairly new to the growing scene but I'm hoping my plan comes together (just started doing cycles this way so I'm not too sure how well it's going to work). I figure it gives my plants plenty of time to grow huge (I want to fill up the 8'x8' tent with beautiful buds) and I don't have to wait 5-6 months for each cycle. Also using LEDs so I'm not paying a huge electric bill (I have HID lights too, just not using them right now). Bought all my stuff on eBay and spent a fraction of the price it probably should have costed me (4'x4' tents were about $45 each and they work great). Not sure cause I've never put a room together for it but I'm guessing the tent would be cheaper. I'll include pictures but my flowering ladies are sleeping so I can't open it up. The plants in the 8'x8' tent are still young and I topped too early (got anxious) so I stunted the growth a bit but there's a decent sized one in hydro too, all still in veg for at least 3 more weeks. Hope this helps.