Plus what innovations? Are they proven to work? I have heard a lot of terrible things about IOTA.
Yes, I don't like IOTA.. But Hashgraph and Nano looking good.
Indeed they need to prove the technic.
What's your basis on why you believe Hashgraph and Nano are "looking good"? The whitepapers? The random promises of their developers?
If Bitcoin's secure, decentralized, censorship resistant and trustless transactions take an average of 10 minutes each to confirm, then I will take that over unproven, might be broken, might be centralized, might be scam cryptocurrencies.
Unless they deliver what they are promising both will be useless coins, I know their project looks fancy in their white paper but that's not everything.
However, having and small amount invested in those currencies could be an insurance of not losing the opportunity.