I'm looking for the best blockchain.

It is necessary:
-quick transaction confirmation;
-scalability (from 2000 transactions per second can be in theory)
-the price of tranze is low or zero
-decentralization (DPoS does not fit)
-resistance to attacks 51%
-other advantages such as contracts
-there are wallets for most devices
-Mainnet successfully works more than six months
-not PoW

Who knows such cryptocurrencies?