What are you paying attention to when investing in any altcoin?
This is my concern to see about the altcoin aspect to define it seems legit or not.
1. Escrow.
2. Roadmap and clear innovation. the important thing about the legal aspect.
3. The publication of the Github code.
3. The team (most of the reliable ico don't run by the anonymous dev)
Well this a summary of what you should know for choosing the best alt coin for you if you wanted to buy and go for trading.
The transparency for the whole team will make it clear and will let you decide if you think that those coins are trustworthy.
Another thing is the market cap of those coins, you can see if it has potential if many invested on it.