Well, everything you read about centralized exchanges are absolutely correct, your identity can be stolen and your funds seized on any of them, thus there is no need seeking one you think is most secure if that is what you want to escape from, as they are all guilty in that regard. There are decentralized alternatives to them, but if you are a day trader and you feel centralized exchanges are your only option, thus you should DYOR and choose the 'biggest' exchange instead of new ones that would steal any deposit you send to them. But even as a day trader, be cautious of the amount of money you leave in the exchange, move the large sums to your non custodial wallets.