Currently, if you want to buy any altcoin, it is very difficult. You can't choose an option quite easily. Also, the crypto market is currently volatile. In such circumstances if one wants to buy altcoin. So what should be the main focus?
In my opinion, if buying altcoin for daily trading i will focus on top coin which has high volume trading. But if buying altcoin for longterm investment i need ton of research how about this coin progress, what will they do in future, etc.