Every coins/tokens has different features, and depends sometimes the support of the community whether it will grow or not. If you are looking for the best you can check in coinmarketcap, it is easy to understand what is the best, altcoin is ETH because it is Top 2 from the market cap. But if you are looking for the potential altcoins you can study by yourself. But try to take a look in POSTOKEN, they already have an beta test for their lending platform.