root riots are better then rapid rooters....they stay wet longer and they much denser....they're also a little bit bigger...for the price and how they dont dry out twice as fast as the rapid rooters...you cant go wrong
I have now used both Root Riot and Rapid Rooters and they are different in a couple of ways:
-Firstly as FallenBuddha says Root Riot are square Rooters are round.
-RapidRooters have a much bigger insertion hole (about 6mm) to the RootRiot (2mm)
-RapidRooters are a much spongier texture than RootRiot. They are lighter and airier as a result and seem to suck up water more easily.
I have only put 1 clone into rapidrooters so far, but I have a few in rootriot a couple of weeks old. I'm interested to see if there is any real difference in the rooting performance of these 2 products and i'll post resluts on here.