There are some factors that need to Notice before Investment on any Altcoins.
Market cap of that Coin
24h volume of that coin.
Maximum supply of coin
Blockchain Technology that Coin is using.
Globalization
Community behind that Altcoin
Whitepaper
Liquidity
If I missed anything then include this in this Topic
good list, you forgot only development team behind the project and future goals and the likelihood they will be accomplished plus what would be the impact on the coin if they're reached