i wonder what makes you trust a new altcoin? what you're looking for in their company page etc...?
One of the best criteria that I am setting before trusting new altcoin is that I know that it is composed of group of people who are really expert in every field in the crypto world. Also, if the new altcoin is recommended and has a high positive rating from several well known ICO review and rating websites.
You cannot trust altcoins immediately unless you read its whitepaper and you find out that it has a really good platform and the projects and developers are legitimate.