How do you claim that both ethereum and bitcoin will make their transaction instant? That sounds weird, frankly. You must be aware of the bitcoin transaction time problem.
You must also be aware about segwit too, maybe he thinks that segwit might make transactions instant on bitcoin but O don't know why he claimed that ETH will have instant transactions in the future too. For me the fastest and cheapest coin to send right now on altcoins is doge since their transaction fee is only 1-2 doge which is 100+ satoshis only. It also takes only less than 5 minutes most of the time for it to have confirmations.