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 not easy to outperform Ethereum in the field of smart contracts, even though there are some shortcomings that ethereum smart contracts have, almost many altcoins expect ADA, it is difficult to achieve because Ethereum has been built and developed, it will take quite a long time for ADA to match smart contracts like Ethereum, currently the most rational thing for ADA is to develop and make it easy for everyone who makes transactions, so that the opportunities they want to seize in the future will be achieved.