Any alt coin suggestion expect ada.In my point of view of ada still can't surpass ETH in the smart contract field and even if they can make it will be hard to be replace existing eth smart contract eco system.Moreover late coming project like sol even surpassing to ada,all things ada have is the loyal user base and nothing special things in tech
It is a reality today that ADA simply cannot surpass Ethereum in the smart contract field even though Cardano is trying to create a smart contract to compete with ETH. Currently only BSC smart contracts are eligible to compete with ETH smart contracts. I consider that ADA is just running as it is without any attempt to make new breakthroughs.