Hello i am new to hydro and want to try it out.. I dont want to spend a lot of money on it so im going to buy from a small store that makes the systems from wal mart products http://www.landmsales.com/hydro_shop.htm What is the difference between a Bubble system and a Drip system? Would I notice any difference in speed of growth or yield between the two? Do the bubble systems make a loud bubble noise? Or is it barely noticeable? This is a stealth grow so it can't really be loud at all. Do the drip systems make any noise? thanks