Safety :

Hashgraph claim they can achieve 255,000 TPS

Radix claim they can achieve +1m TPS

Of course no benchmarks are available, hashgraph needs obviously to use encryption that slow down the network, hashgraph’s network can lead to a stalemate coz of Nash Equilibrium. They have a quick network that is unsafe (at least for Hashgraph, i don’t know Radix and the others)

Safety is the measurement of “uptime” of the network. Blockchain for now had a 100% uptime, so it can be considered as safe (even if the mining is centralized and the difficulty that dont uptade can stop the chain, for now it has been safe). Hashgraph is not safe.

Indeed, let’s imagine stocks built on hashgraph with everything encrypted. If somehow there is a flash crash then everyone will want to buy because it will go up. Therefore everyone will gossip to buy and people will ignore each other : no transaction will be made : stalemate. Moreover people will see that a flash crash is incoming, and therefore will buy before gossip the fact that the flash crash is coming and it will just be random shit because the traders knowing that a flashcrash is coming have 2 options : gossip the crash and/then his buy, or gossip his buy then the crash. For the first one another traders will have the same choice, and for the second option his buy will be gossiped and will spread all over the network, therefore he will buy before the crash. Therefore he has no option to buy during the crash : no one can buy during this crash : stalemate

That is considered as unsafe, at any moment the system can stop, and you just need to sell at market price for couple of millions to do it. Moreover you can calculate how much you need to sell to do so. Everyone with enough money can stop the system : this is unsafe

Blockchain is rather safe comparing to hashgraph, it cost more than couple of millions to get more than 51% of the hashrate :)