2 gallon coco will make monsters with many strains. My drobe at the moment is 1 gallon, more or less, and two of the plants are doing their damndest to take over about four square feet each. My WDA and DG would likely be headed for my lights had I not topped them.
I like the control that I have with my current setup with coco, but it sure is a lot more work than soil. The worst of it at the moment is that I think I am chucking more than about 30% of my water supply down the drain as runoff, which since I am now melting snow to get it is a pain in the ass. If I was on town water, I'd be onto an RO system in a heartbeat.