I agree that IOTA is the biggest thing since Ethereum, I think technology wise it's even bigger. Just about all altcoins are copies of Bitcoin that have been modified in some way, they all use a blockchain, they all have scaling limitations, most of them have fees to send transactions. The technology behind IOTA and the tangle system they have created is phenomenal, limitless scale-ability and zero transaction fees make it the most advanced cryptocurrency yet... It's Bitcoin 2.0