roll with the 3 all the way,coco has no nutes and you provide them,you also on drip so no problem with a continuse feed program,clones dont grow a tap root so the feathering roots will build in the pot anyway,tap root normally hit bottom and plant just explode,clones seem like they just arent growing and then like a light switch it on hahahah,save room with the 3 is my opinion,a 3 will give you a great root system for indoor grow,outside i wouldnt even bother with coco,ive run it and dont like it a bit,to much damn work and im a lazy bastard,to be honest i havent really seen any difrence from a soil vs coco grow,soil is slow to the taproot again hits bottom and it explodes and coco from seed takes just as long in my opinion,it will out run the soil at first because you provide the food for it,soil takes only what it wants,but by harvest time ive found maybe a week quicker growing same strains