Labcoin looks nice even though they are still using 130nm chips. Their estimated cost/GH looks great. Since they aren't looking to update to current gen/next gen chips i find this to be realistic and possible.

BTCGarden on the other hand seems kinda expensive when it comes to cost/GH in the chips. Those kinda prices make the ROI slightly high for the end users. Also 130nm chips as well. Making it easier to get to market since it relatively common place right now.

At the cost/chip labcoin seems to be the competition here. However over the long term more and more people are going to want 28nm chips to save on electricity costs, specially as difficulty skyrockets as the network works it's way to 25k TH or more. First ones with the cheaper to run chips are a better investment, IMHO.

You may get a quicker buck day trading with Labcoin and BTCGarden for the next little while, but I don't it is a good enough reason to bail on ActM. I maybe buy some shares of the other two as well but I still see ActM as holding it's value after the initial panic selloff to buy the other two is over.